30.His success in the exam was _____ _______(绝非偶然).

29._____ _______(正如……一样) the skill in playing the piano, learning English needs a lot of practice.

28.Mr. Stevens ________ ________ _____(保持联系) his business by telephone when he was in the hospital.

27.I know she made you angry, but ______ _______(毕竟) she is your friend, isn’t she?

26.If you try to look up every new word you come across in a reading passage, you will soon ____ _____ and it will slow down your reading.

25.In his a_______ to win an Olympic medal, Liu Xiang did better than expected.

24.K______ _____ ____ your mistakes and try to learn from them.

23.This fish must be put into cold s__________ as soon as possible.

22.We do cut and p______ , but we don’t use scissors or g_______.

21.In order to get the exact result, the scientists made ______ ____ ______(反复实验；不断摸索).