How is your work getting along?

I can't carry on ________ any longer. I have to get some help.

[　　]

She is almost 2 hours late. What ________ to her?

[　　]

A．should have happened

B．must have happened

C．may have happened

D．can have happened

It was not for several years ________ I had an opportunity of meeting them again.

[　　]

Whether ways will be found to stop pollution or not is just ________ worries the public.

[　　]

He is said ________ when he was shopping in that big mall.

[　　]

A．being caught to steal

B．caught to steal

C．to be caught stealing

D．to have been caught stealing

In order not to be disturbed, I spent three hours ________ in my study.

[　　]

Children under six are not ________ to school except those of extraordinary intelligence.

[　　]

You don't seem to be quite yourself today. What's wrong?

Oh, I'm suffering from a cold. Nothing serious, ________.

[　　]

________ he returns to his native land.

[　　]

A．It is long before that

B．It is before long

C．It won't be long before

D．It will be before long that

________ a reply, he decided to write again.

[　　]