用句中划线单词的适当形式填空

The professor is ______ (dip) （浸） one finger into the cup now.

I have a few questions ______ (ask).

Cotton ______ (feel) very soft.

The young man over there ______ be at least twenty-five years old.

Please fill the bottle with ______ (milk).

用情态动词（can, may, must, need, have to, be able to）的正确形式填空：

The red light is on. We ______ stop.

用情态动词（can, may, must, need, have to, be able to）的正确形式填空：

We'll ______ finish it in time.

You ______ drink this, it isn't clean enough.

用所给单词的适当形式填空