A Wechat(微信)is an invention ________can help people talk to friends,share photos,ideas and feelings freely .A、which B、who C、/
Our teacher expects all of us ______ happy and independent children.
—Susan, I have a sore throat.—You talked ______ just now. Please drink more water.
—Could I open the door?—______. It’s very cold outside.
I think these students should do ______ part in keeping the class-room clean.
When my mother ______ home, I was making some cards.