Bears ______ fat stores throughout the summer and fall to have energy enough to last them through winter sleep.

Recently public bicycles ________ in some big cities in China. It makes people’s life much more convenient when they go around.

Whydidn’t you buy the gold ring—I ______ but I didn’t have the money

There _______ any homework tonight. Shall we go to see a film

I think it _______ to smoke . —— _______.