With the help of the smart phones, you ____ video chat with your friends on the phone.

Lingling, do you know ___________ woman in white?—Yes, she is __________ nurse in Children’s Hospital.

People can’t live _____ plants. [ ]

If you want to have a hot bath, you should pay ________ money.—- You mean the fee of hot baths is not ________ in the hotel price?

_____ homework, most students do it every day.[ ]