一What will the weather be like tomorrow一It be rainy ,cloudy or sunny．Who knows Even the weather report is not always right.

The visiting professor gave us some advice,________ of great help to our English learning.

What do you think of pollution of the big factory— It’s a serious problem. We should _____ all the people to do something for it.

I hope my classmates can come up with a way to _______ the sick boy.

_by the noise, they had to finish themeeting early