Tenses Exercise For Class 8 CBSE

Fill in the blanks with an appropriate tense form.

Notes

The present perfect is the most common tense for giving news.

Tenses exercise for class 8 CBSE

Biomedical researchers ……………………. (developed / have developed / had developed) drugs capable of defeating ‘super bugs’, the bacteria that ………………….. (developed / has developed / have developed / develop) resistance to common antibiotics. Researchers at the Boston University ’s College of Engineering ………………………. (discovered / are discovering / have discovered) a previously unknown chain of events occurring in bacteria that ………………………… (opens / is opening/ opened) the door to new avenues of research. The findings may …………………………. (revitalizes / revitalize / revitalized) development of antibiotic drugs that …………………………… (will do / shall do / could do) their job better.

Answers

Biomedical researchers have developed drugs capable of defeating ‘super bugs’, the bacteria that have developed resistance to common antibiotics. Researchers at the Boston University ’s College of Engineering have discovered a previously unknown chain of events occurring in bacteria that opens the door to new avenues of research. The findings may revitalize development of antibiotic drugs that will do their job better.

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