The children ______ very quiet; I wonder what they ____up to.
—You know,I’m poor in Chinese,you are not good at English,and...—That’s we should help each other.
—I drove to Zhuhai for the air show last week.—Is that you had a few days off?
Before a problem can be solved,it must be obvious____the problem itself is.
The policy of the mainland is very clear and straightforward,and the key problem is_____the leaders of Taiwan will accept it.
The shocking news made me realize terrible problems we would face.