Mr. Zhang ________ as an engineer since he came to the computer company in 2008.

Must I use both hands?-Yes, you _____.

________are in the same class.

_______ the teachers in the school is one hundred, and ________ of them are women teachers.

I think English is __________ unimportant subject.— I don’t think so. It is __________ useful tool when we talk with foreigners.