China is one of the developing countries ________ the third world.
John and I__friends for eight years. We first got to know each other at a Christmas party. But we__ each other a couple of times before that.
— I will come to attend your lecture at 10:00 tomorrow. — I’m sorry, by then my lecture will have ended and I__my guests in my office.
— Has Jack finished his homework yet? — I have no idea;he __it this morning.
The traffic in our city is already good and it __even better.
I’ve finally finished my paper and it __ me an entire month.