The professor________ the perfect return of Shenzhou 7 in 2008______ “the most exciting thing in history” in his speech.

The poisonous atmosphere will surely ______a lot of people.

I am afraid I am not fit for the job, because it is one requires a lot of patience.

He couldn’t take part in the final exam _______ his serious illness

I think it’s impossible for us to work out the plan in just two days. It’s too difficult.—-You’re right. We can’t be _______ careful and hard while working on it.