Little Tom has got a lot of birthday presents, but he isn’t able to take all of them ___.
| A．on time | B．at a time | C．at same time | D．from time to time |
We can have ___ blue sky if we create ___ less polluted world.
| A．a. a | B．a, the | C．the, a | D．the, the |
-----Did you notice him come in?
-----No. I _____ a football game.
| A．have watched | B．had watched | C．am watching | D．was watching |
You should return the digital camera to Sally ________she will get angry.
| A．so that | B．because | C．before | D．or |
He couldn't _________an answer when I asked him why he was late.
| A．come over | B．cat up with | C．come out | D．come up with |