1 . 用方框内所给短语的正确形式填空

once and for all,     subscribe to,     in general， speak up，   participate in

1. Bill and Tom asked the teacher to settle the argument ________ .
2. ________, the two scientists’ methods have much in common, but the results are quite different.
3. My friend said that he was willing to________ the voluntary activity.
4. I have never ________ the view that schooldays are the happiest days of life.
5. If you never ________, people will not know what you are thinking about.

3 . Except for working hard, we should give more attention to proper exercise and enough sleep. ________, health always comes first.

A．For instance

B．So far

C．In general

D．After all