She worked hard ________ everything would be ready by the time he came back.
| A．since | B．so that | C．as if | D．unless |
20. When a stick is partly in a glass of water, it looks ________ it were broken.
| A．even though | B．although | C．as if | D．so that |
19. Have a little chicken, ______?
| A．don’t you | B．oughtn’t you | C．will you | D．shall you |
17. Besides our group ,we need 20 extra workers to get the work finished in time.
| A．around | B．about | C．or so | D．some |
16. She became very popular after she won the Oscar ________ last year.
| A．Prize | B．Award | C．Reward | D．Medal |
15. The hiding man made a hole in the wall ______ he could observe the outside.
| A．in which | B．by which | C．through which | D．with which |