Little Tom should be ________ to the zoo this afternoon.

[　　]

 He promised to come to see you.

 But he ________. I have been alone.

[　　]

This kind of actors ________ easily found, directors of the kind ________ scarce.

[　　]

I'm surprised to find the editor is a girl ________ 13, who began to be a journalist ________ 10.

[　　]

A．at ,at the age of

B．of, at the age of

C．aged, at the age of

D．aging, at

Such problems ________ pollution and heavy traffic ________ becoming more and more serious.

[　　]

Mike made an opening speech ________ the beginning of the meeting, ________ the end Tom gave a summary talk.

[　　]

There are many books for us ________ in our library.

[　　]

Chaplin acted 35 films ________ he wrote and directed himself.

[　　]

In many countries of the world, girls live with families ________ they work as servants.

[　　]

 I thought you wouldn't mind.

 Well, as a matter of fact, I ________,but you ________ first.

[　　]

A．didn't, should let me know

B．don't ,should let me know

C．don't, should have let me know

D．didn't, should have let me know