We should protect the earth because it’s home to _______animals.
| A．million | B．millions |
| C．million of | D．millions of |
—The Mars-500 test will take about 520 days.
—__________ I hope it goes well.
| A．It’s a pleasure. | B．Good luck! | C．That’s OK. | D．Congratulations! |
Tom _______ the USA. He _______ back in two months.
A. has gone to; comes B. has gone to; will be
C. has been to; comes D. has been to; will be
—I don’t know _______ now.
—She is much better today.
| A．how is she | B．where is she | C．how she is | D．where she is |
_______ they are twin brothers, they don’t look like each other.
| A．Though | B．Since | C．However | D．When |
—Do you mind if I smoke here?
—_______ You can go to smoke in the next door.
| A．Yes, please. | B．Never mind. | C．You’d better not. | D．Of course not. |