It is a good habit to go to ______ bed early and get up early.

Why don’t you eat more, Lily?—Sorry, mum. I can hardly eat _________. I am not feeling well today.

To help a friend solve the problem troubling him,.

Yesterday I lost my pencil sharpener. I couldn’t find_______.—Oh, it’s a pity. You’d better buy ________ this afternoon.

On the 40th Earth Day, Dr Wang gave us a talk on the importance of ______ the earth.