（ ） 51. Maybe I won't come back_______six o'clock. Don't wait.
A. away B. if C. until D. when
（ ） 52. The __________ is very hard. I can't answer it.
A. problem B. question C.matter D. thing
（ ） 53. He didn't eat lunch. I didn't .________.
A. too B. also C. either D. so
（ ） 54. He is the tallest ______ our school.
A. of B. in C. from D. to
（ ） 55. I am better at ________ than ________.
A. singing…dance B. sing…dancing C. sing…dance D. singing…dancing
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