It’s helpful to put students in a situation _______ they can learn how to cooperate with each other.

A. thatB. when C. which D. where

You needn’t have ________ the speaker when he was speaking; there was enough time afterwards for you to ask questions.

A. affectedB. interrupted C. involvedD. disturbed

There is no doubt _______ nearsightedness is a serious problem among the youth of our country.

A. / B. which C. whetherD. that

The secretary worked late into the night, ______ a long speech for the president.

A. to prepareB. prepared     C. preparing D. to be prepared

It was only then ______ I began to have doubts about whether my story had ever been told.

A. whenB. SinceC. thatD. yet

He is very_____; it is impossible to talk him into doing anything he doesn’t want to.

A. stubbornB. curiousC. skeptical D. gracious

—Lucy, go do the washing please.

—_______ I just did it yesterday.

A. It’s your turn. B. It’s up to you.      C. So what? D. With pleasure.

They must have gotten to the top of the mountain by now. They_____ before the sun rose.

A. settled downB. set out      C. took off D. turned up

—I have telephoned him twice but I couldn’t get through.

—I think that the line _____ be being worked on today.

A. should B. might C. needD. would

It is best to eat three meals a day; otherwise, it is possible____ your health will suffer later in life.

A. that B. when C. while D. as