Scientific advances over the last fifty yearshave ledto revolutionary changes in health, agriculture and communication, andgenerallyenhancingsocio-economic development and the quality of ourlives.

Choose the option that indicates the error in the sentence.

Some of the workers . . . . . . . . the peaches while the others . . . . . . . . them in wooden boxes.

Rewrite the following sentence using the correct tense in simple past or past perfect of the verbs givenin the brackets:…

Fill in the blank with the most appropriate word.<br>I'll go out after I ________ reading this detective story.&lt…

For most of the time throughout the picnic, the boys . . . . . . . . football while the girls . . . . . . . . flowers.

Fill in the blank with the most appropriate word.<br>He ________ late yesterday.<br>

Fill in the blanks with the most appropriate option:Christopher Columbus didn't know where he _______. When he landed he…

Fill in the blank with the most appropriate word.<br>The nurse doesn't understand why the girl _________.<br&gt…

Fill in the blank with a suitable option:<br>The doctor recommended that she ___________ in bed for a few days.