Li Na plays____________ tennis very well. She has become _____________first Asian woman to reach a Grand Slam(大满贯) final.

Depression is the leading cause of suicide, ____ in turn is the third leading cause of death among

I was asked to attend the meeting before eight.—Oh, you________. I’m sorry for not telling you that we have changed the plan.

I’m afraid I won’t come _____ 7 and 9. I will be at work then. [ ]

The scientist has made quite a few discoveries, ______ of great importance to the whole world.