sn’t spend any more money on clothingthan I do, but_________he manages to look so stylish.

If you want to ________ the narrow hutong of old Beijing, tricycles are worth ________.

Mrs Smith lives next to us. She is really a good _______, because she always helps us.

To live a green life, we should try to save ____ energy and produce＿＿pollution.

It was quite a serious mistake, ____caused by carelessness.