I find hard to get on with him.

I feel blue these days.—Why? What makes you so _________? Cheer up, please.

Taobo is Asia’s largest retail（零售的） network platform, ______ people can buy and sell many kinds of things．

I called Nina several times, but she didn’t answer. — Of course, she ____________ London for a visit.

The young girl stood there ______ without saying anything.