The 　　 　 change of schedule gave me lots of trouble.

A.ambiguous B.abrupt C.abundant D.authentic

. It’s OK to _______ an electrical appliance on so long as you are using it.

A. leave　　　 B. make　　　 C. turn　　　 D. open

As the saying goes, f________ is the mother of success.

Can you think of some cases 　　　　　 drivers obviously knew the traffic rules but didn’t obey them?

　 A．why　　　　 B．where　　　 C．a(chǎn)s　　　　　 D．which

I am afraid that the grandparents have some ___the naughty grandson.

A trouble with B trouble in C troubles in D troubles with

After ten years of hard work, they at last got_____.

A. out of debt　　　　　　 B. into debt

C. in debt　　　　　　　　　　 D. out of debts

Talking about buying cars, I prefer a car less than 100,000 yuan to _____ over the amount．

　 A． this　　　　 B． it　　　　　 C． that　　　　 D． one

　　　 that she didn’t do a good job, I don’t think I am abler than her.

A. To have said　　　　 B. Having said　　 　 C. To say　　 　　　　　 D. Saying

He must be helping the old man to water the flowers, ________?（ ）

A. is he　　　　　　　　　　　 B. isn’t he

C. must he　　　　　　　　　　 D. mustn’t he

I am i______(印象) by the growing number of plays and operas that are now being staged in this city.