Scientists think that the continents ____ always where they ___today.

I don't really work here; I ____ until the new secretary arrives.

“What place is it?” “Haven’t you found out we _____ back where we ______?”

The town’s drinking-water _____ with prim chemicals at present.

 -Have you seen the film? --Yes. I _______ it three times when I was in Tokyo.

-Jack is ill in hospital.  --Really, I _____ him right now.

-----What _____?-----I______my key and can't open the door. 

I___ to have another try if I get another chance.

Oh, it's you, I'm sorry I ____know you ____here.

Wherever I ____these days. I always carry my umbrella.

It is five years since my dear aunt _______ here.

It ________ nearly two weeks ______ I had received his letter.

----This returned Chinese scholar has become one of the top experts in this field.----Yes,I know him very well.He____in Africa with animals for eight years.

----Does Liu Hua serve in the army?----No,but he ___in the army for three years.

The boss praised the young man for his hard work, though he ___ experience.

 If you ______ stop smoking , you can only expect to have a bad cough .

---Those shoes won't_____for mountain-climbing.　　---_____this pair be OK?

The book was received so eagerly that it _____ on the first day.

I’ll come after the meeting if time ______. 

I can’t leave. She told me that I_____ stay here until she comes back.