It is usually warm in my hometown in March, but it ________ be rather cold sometimes．

A．must

B．can

C．should

D．would

Alice returned from the manager's office, ________ me that the boss wanted to see me at once．

A．having told

B．tells

C．to tell

D．telling

The work is easy for an expert ________ it is difficult for an inexperienced person．

A．because

B．therefore

C．while

D．unless

Can you imagine the difficulty I had ________ these problems?

A．settled

B．to settle

C．settling

D．settle

________ fashion differs from country to country may reflect the cultural differences from one aspect．

A．What

B．That

C．This

D．Which

The new technology will make ________ possible to grow food with very little water．

A．it

B．it is

C．that

D．that is

All these changes will lead to ________ stronger and more powerful China, ________ country that can surprise and enrich our planet．

A．a；a

B．a；the

C．the；a

D．the; the

I ________ a topic for the composition, but haven't decided yet．

A．will think about

B．was thinking about

C．had thought about

D．have been thinking about

Little ________ about his own safety, though he was in great danger himself．

A．cared he

B．he cared

C．did he care

D．was he cared

The CEO always tries his best to create an atmosphere ________ his employees can express their opinions freely．

A．for which

B．which

C．where

D．of which