Though Professor Liu ____ in New York for seven years, he has never regretted moving back to Shanghai, his hometown.
Since the forest has been destroyed by a big fire, a large ______ of trees ______ to be planted on the mountain.
Monkeys in the zoo started to show the flu _____ last Monday and altogether twenty have died up to now.
—I’m sorry to keep you waiting for so long.I’ll make short work of my lunch.—____.I’m not in a hurry.
For a moment nothing happened.Then _____ that the war was over.
_____ my advice, you would not be in such a terrible situation now.