_________ pens are there on the desk— Eleven.

We’d better ask Jim to discuss the plans of our subject with us tonight.— Yes, I’ll call him at once.

I’m green at everything—Don’t worry________you get older，you will get more experience

You might as well expect a river to flow backward ____ us carrying out the plan

What do you think of this matter? —This is a matter of__________ importance. I think.