19) There can be on doubt that he is the right person for the job.
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21) There is no doubt that these measures will contribute to the solution of the problem.
22) There is no doubt that Jim had more talent than anybody who ever played football.
23) There’s no substitute(替代物) for practical experience.
24) There is urgent need to debate this issue openly
25) There are tow ways in which one can own a book.
26) There have been some small fluctuation(波動) in the past year, but by and large prices have remained stable.
