11. She has been working hard day and night during these years ________ she could pay for the necklace. A. in order that B. as long as C. the moment D. because ...

6. There isn't any difference between the two. I really don't know _________. A. where to choose B. which to choose C. to choose what D. to choose which ...

6. They focus their eyes at the bag in the corner of the room. A. 错误 B. 正确 ...

1. He turned off the light and locked the door, believe nobody was in the room. A. 错误 B. 正确 ...

16. We ________ the work on time without your help. A. hadn't had finished B. didn't have finished C. couldn't have finished D. can't have finished ...

4. Window screens are ________ in keeping out mosquitoes and thus very popular in summers. A. affected B. infected C. effective D. infective ...

8. Prices vary with the seasons. A. 错误 B. 正确 ...

3. Her voice was imbued with an unusual seriousness. A. 错误 B. 正确 ...

17. In order to make his parentless nephew feel at home, he _______ one of the rooms into a bedroom for the boy to live in. A. designed B. decorated C. altered D. organized ...

10. It was so noisy in the classroom that the teacher couldn't make herself _________. A. heard B. hearing C. to hear D. hear ...