The river is very deep. My mother warns me _________ in it.

I’d rather ride a bike as bike riding has _____ of thetrouble of taking buses.

You can’t how happy I was when I saw Li Yifeng! He’s my idol.

The man we followed suddenly stopped and looked as if whether he was going in the right direction. [ ]

_______ work did we have to do that we were soexhausted.