With Shanghai World Expo drawing near, volunteers are making use of every minute to ________ their foreign language because language volunteers must pass a written test and an interview.
The illness of her son is so ______ that she cannot go to sleep at night.
_______ you work hard, you won’t solve this problem.
My uncle _____ in Taiwan for 20 years. Now he has settled down in mainland.
No doubt she will be late. It’s ______ of her to keep all the other guests waiting.
The teacher was absorbed in writing something, only _____ now and then to refer to a book or another.