.Beginners of English can _________ quite well without learning any grammar rules.

The scientist began his talk as soon as we_____. [ ]

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

I want to buy a bike. At last I decided ____ a black one.

Deng Ziqi is very popular among teenagers.—Yes. Many middle school students are her .