选出句子中画线部分的近义词：We are going to say goodbye to them. (   )

A．will

B．do

C．won’t

We are going ______ together. （   ）

A．have lunch

B．to have lunch

C．to have a lunch

What are your parents ______ tomorrow? （   ）

A．do

B．going to do

C．doing

请根据所给词的适当形式填空。
1. Tom wants to ____________ (buy) a postcard today.
2. Go straight for five ____________ (minute).
3. Usually he ____________ (walk) to school every day.
4. This is my book, that is ____________ (you).
5. Sarah ____________ (take) a trip next week.

You're getting fat. You _________do more outdoor exercise. (    )

A．will have to

B．will must

C．must to

D．has to