Tenses Exercise for Class 10 CBSE

This tenses exercise is helpful for students preparing for their class 10 exam conducted by CBSE.

Fill in the blanks with an appropriate tense form.

1. 2007 ………………………….. the beginning of the International Polar Year.

a) marks

b) marked

c) has marked

d) had marked

2. In recent years, the Polar Regions ……………………….. to change drastically as a result of global warming.

a) begin

b) began

c) have begun

d) has begun

3. Microsoft’s coffee-table computer, Surface, ………………………… to touch and to special bar codes attached to everyday objects.

a) is responding

b) respond

c) responds

d) has responded

4. Mann Deshi Mahila Sahakari Bank ……………………………. women with affordable and easy access to credit.

a) provides

b) provide

c) are providing

d) had provided

5. The President of India ………………………….. by an electoral college consisting of the elected members of both houses of the Parliament and the elected members of the State Legislative Assemblies.

a) is electing

b) is elected

c) elected

d) is being elected

6. Researchers ……………………….. through studies that internet searching and text messaging make brains more adept at filtering information and making snap decisions.

a) are finding

b) have found

c) have been found

d) find

7. The internet can create addicts whose only friends are virtual and who ……………………….. from high rates of attention deficit hyperactivity syndrome.

a) are suffering

b) suffer

c) suffers

d) have suffered

8. Scientists have created what they claim is the world’s first artificial heart that …………………….. exactly like the real one.

a) is beating

b) beat

c) beats

d) has been beating

9. When Brazilian scientists ………………….. aggressive African bees to Brazil in 1956 they only wanted to breed a better honeybee.

a) bring

b) had brought

c) brought

d) were bringing

10. The experiment failed and some of the African bees escaped and ……………………. with local species.

a) breed

b) have bred

c) bred

d) had bred

11. After the explosion in the core of the reactor, Chernobyl and nearby towns ……………………

a) were evacuated

b) have evacuated

c) had evacuated

d) was evacuated

Answers

1. marked; 2. have begun; 3. responds; 4. provides; 5. is elected; 6. have found; 7. suffer; 8. beats; 9. brought; 10. bred; 11. Were evacuated

Tenses Exercise for Class 10 CBSE – Exercise 2

Fill in the blanks with an appropriate tense form.

1. So far, killer bees or the Africanized honey bees ……………………. more than 1000 people.

a) killed

b) are killing

c) have killed

d) had killed

2. During the International Polar Year, which lasted until March 2009, thousands of researchers from more than 60 countries …………………….. more than 200 projects and expeditions to both poles.

a) have conducted

b) has conducted

c) conducted

d) conduct

3. Temperatures in polar regions ………………………. faster than anywhere else on Earth.

a) rise

b) have risen

c) are rising

d) rose

4. Technically speaking, Africanized honeybees are no more venomous than regular honeybees, but they …………………. agitated much more easily and stay angry longer.

a) become

b) became

c) are becoming

d) had become

5. The Formosan subterranean termite, a Chinese native, flies, …………………… in vast clouds, and munches through concrete, bricks, or mortar in an attempt to reach wood.

a) swarm

b) swarms

c) swarmed

d) are swarming

6. The tsetse fly that ………………… sleeping sickness is the most dangerous among flies.

a) cause

b) causes

c) is causing

d) caused

7. An explosion in the graphite core of the nuclear reactor released radioactive material that …………………… over parts of the Soviet Union, eastern Europe, Scandinavia , and later western Europe.

a) spread

b) spreads

c) was spreading

d) has spread

8. Nuclear power is generally harmless, but there ………………….. instances when security measures failed either due to negligence or through accident.

a) are

b) have been

c) have

d) had been

9. On April 25, 1986, engineers conducted an unauthorized test which …………………… an uncontrolled chain reaction in the core of the reactor.

a) initiated

b) initiates

c) has initiated

d) was initiating

10. On April 26, an explosion ripped the containment building apart, …………………… radioactive material into the atmosphere.

a) expelling

b) expels

c) has expelled

d) expelled

11. After the explosion in the Chernobyl nuclear reactors, the Soviet authorities refused to admit that an accident ……………………

a) occurred

b) has occurred

c) had occurred

d) was occurred

12. Barack Obama …………………………… in as the 44th President of United States on January 20, 2009.

a) was sworn

b) sworn

c) had sworn

d) has sworn

Answers

1. have killed; 2. conducted; 3. are rising; 4. become; 5. swarms; 6. causes; 7. spread; 8. have been; 9. initiated; 10. expelling; 11. had occurred; 12. was sworn