4. This machine is very easy______. Anybody can learn to use it in a few minutes. A. operating B. to be operating C. operated D. to operate
5. Before driving into the city, you are required to get your car ____. A. washed B. wash C. washing D. to wash
e.g. The boy offered to give his seat to an old man.
B. 动词 + 疑问词 + to动词不定式作动词tell, show, understand, explain, teach, learn, advise, discuss等词 的宾语时,前面常带疑问词。
8. No matter how bright a talker you are, there are times when it's
better__________silent.
A. remain B. be remaining
C. having remained D. to remain
9. George returned after the war, only _______ that his wife had left him.
It is + adj. + (for/of sb.) + to do sth.
It's difficult to finish the task without teacher's help. It’s necessary for you to study hard . It’s foolish of him to do it .