[单项选择]Since we have never been here before, we do not know which bus ______.

[单项选择]Since we have never been here before, we do not know which bus ______.
A. should we take
B. to be taking
C. to take
D. should take

[单项选择]______ for your help, we never have been able to overcome the difficulties.
A. Had it not
B. If it were not
C. Had it not been
D. If we had not been

[单项选择]______ for your advice, we'd never have been able to overcome the difficulties.
A. Had it not
B. If it were not
C. Had it not been
D. If we had not been

[单项选择]______ for your help, we'd never have been able to get over the difficulties.
A. Had it not
B. If it were not
C. Had it not been
D. If we had not been

[单项选择]______ for your help, we' d never have been able to get over the difficulties.
A. Had it not
B. If it were not
C. Had it not been
D. If we had not been

[单项选择]________ for your help, we’d never have been able to finish the work.
A. It was not
B. Had it not been
C. Hadn’t it been
D. If it had been not

[单项选择]________your help, they'd never have been able to overcome the difficulties.
A. Were it not
B. If it was not
C. Had it not been for
D. Had it not for

[单项选择]

There seems never to have been a civilization without toys, but when and how they developed is unknown.They probably came about just to give children something to do.
In the ancient world, as is today, most boys played with some kinds of toys and most girls with another. In societies where social roles are rigidly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers. This is true because boys and girls are being prepared, even in play, to step into the roles and responsibilities of the adult world.
What is remarkable about the history of toys is not so much how they changed over the centuries but how much they have remained the same. The changes have been mostly in terms of craftsmanship, mechanics, and technology. It is the universality of toys with regard to their development in all parts of the world and their persistence to the present that is amazing. In Egypt, the Americas, China, Japan and amon
A. their social roles are rigidly determined
B. most boys would like to follow their fathers' professions
C. boys like to play with their fathers while girls with their mothers
D. they like challenging activities

[单项选择]

We have been told that under no circumstances we may use the telephone in the office for personal affairs.（）

A. may we use
B. we should use
C. did we use
D. we could use

[单项选择]We have been asked to defend ourselves and what we hold dear in cooperation with ______ who share with us the same endangered air and the same endangered oceans.
A. a country
B. a city
C. an area
D. all of the people

[单项选择]—Have you been here long —______.
A. No, not very
B. Not much
C. Yes, only little
D. No, only yesterday

[单项选择]Never have we had ______ weather before.
A. such a fine
B. such fine
C. so fine
D. so fine a