题目内容
There are many problems______the new program.
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Each of the fifty US states has its own flag; in addition to this, each one has a state bird, ______the mockingbird for Florida.
After you reach the fourth level of sleep, ______from one level to another.
Tom: So, ______？
Boris; Oh, nothing much. The usual things, you know.
Tom; Mm. . . still working at the same place, I suppose？
Boris; Yes, that’s right.
If you buy twenty or more you will get a______.
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