1. It’s very ______ you to get the tickets ______ the World Cup.

A. for, of  B. of, for  C. of, to  D. to, for

2. How many teachers are there in your school?

 ______, I think. But I don’t know the exact number.

A. hundred  B. Hundreds  C. Hundreds of  D. Hundreds or thousands

3. Will you stay for lunch?

  Sorry, ______. My brother is coming to see me.

  A. I mustn’t   B. I can’t   C. I needn’t   D. I won’t