15. ______ your best? It's not satisfactory. I'm afraid you will have to do it again. A. Do you try B. Have you tried C. Are you trying D. Have you been trying ...

8. Tell the students to stop shouting. We ______ our essays now. A. write B. have been writing C. are writing D. have written ...

2. She ______ her mother's work since she was admitted into hospital. A. is doing B. has been doing C. has done D. has been done ...

1. It was impossible for lost time to make up. A. 错误 B. 正确 ...

16. The student was made ______ the text ten times. A. copy B. copying C. to copy D. be copied ...

11. It is impossible for the plan ______. A. to put into practice B. not to put into practice C. to be put into practice D. to be not put into practice ...

6. Our city is ______ yours. A. as bigger as B. as bigger than C. biger than D. as big as ...

1. There are several ______ leaves on the ground. A. falling B. fallen C. to fall D. fell ...

6. When a man and a woman hit by his arrows, they will fall in love. A. 错误 B. 正确 ...

1. Bathrooms in many countries may be different from the kind you are used to. A. 错误 B. 正确 ...