16. Zhang Hua does a lot of housework every evening, but now he ________ his schoolmates with their lessons.

　　A. help B. is helping C. helps D. has helped

　　17. Mother washes the girl's hair. Look, she ________ .

　　A. is washing it now B. washes it

　　C. is washing them now D. washes them now

　　18. He usually listens to the radio, but at the present moment he ________ television.

　　A. watches B. is watching C. has watched D. had watched

　　19. How long ago ________ playing with soldiers?

　　A. have you stopped B. had you stopped C. did you stop D. do you stop

　　20. Look at John! What _______ ?

　　A. does he B. he is doing C. is he doing D. does he do

　　21. It ________ hard when I left my house.

　　A. is raining B. rains C. was raining D. will rain

　　22.The railway ________ in three years.

　　A. is complete B. will completed C. has completed D. will be completed

　　23. Don't talk so loudly. Your father ________ .

　　A. sleeps B. is sleeping C. slept D. had slept

　　24. ----- What are you doing under the table?

　　----- I ________ to find my pen.

　　A. tried B. had tried C. try D. am trying

　　25. Jane and Tom ________ the door.

　　A. are walking at B. walk at C. walks to D. are walking to