_____ a smile on his face, he came into the classroom.
| A．Have | B．Has | C．There is | D．With |
–Tom, it’s time to go to bed.
-- Oh, I won’t do that _____ I finish my homework.
A. if B. until C. after D when
_______ he is young, ______ he knows much.
| A．Though; but | B．Though;/ |
| C．Although; but | D．Because; so |
______ he is in trouble, his best friend always helps me.
| A．Whenever | B．Whatever | C．however | D．Never |
The plane was late, _________ we has to wait for half an hour.
| A．because | B．or | C．so | D．but |
Tony never spends money on traveling____ he likes staying at home.
| A．but | B．because | C．though | D．until |