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1.They must clean and tidy their school.
->They must keep..................................
2.Some vistors to Britain get depressed by the weather.
->Some visitors to Britain find..............
3.Nam has no problems in making friends.
->Nam finds it........................................
4.He found that it was difficult to tell them the truth.
->He found it...........................................
5.English pronunciation confuses us.
->We find................................................