Driving to work used to be popular. — That was true. But ________, more and more people go to work by bike to avoid traffic.

Dad, I have got an award for Best Student in our school.—Congratulations! But remember not to ________ everywhere.

They do not provide a _______ energy supply.

I can do lots of housework, _______ cleaning, washing, cooking and so on.

The book is for us to read.