Space exploration began in the 1960s, and since then about five hundred people    into space.

—Do you think he can get the first prize for jumping?
—Impossible now. He    to do so, but he has just hurt his leg.

—Hi. Mary. Do you still remember the first time we met?
—Sure. You    dinner with your friends in a restaurant.

All school buses in the northwestern provinces    with satellite positioning devices next year.

It was a pity that when we hurried to the lecture hall, the lecture_________, so we heard only the end and missed most part of it.

His ex-husband, whom she _________ last year, is now living in America.

- You look exhausted!
- I __________ tennis with my friend all the morning.

— Can Jeremy Lin lead New York Knicks to win the next game?
— Out of the question now. He ______ to do so, but he has just hurt his leg.

If you ______ a fresh mind for an interview, be sure to have a good sleep the night before it.

—I’ve got to go now.
— Must you? I _________ you could stay for dinner with us.