Ex4. Find the mistake andcorrect it in each following sentence.
1. They visited Dalat with their friends in November tenth, 2012.
2. She enjoyed to write English more carefully than her sister did
3. They use to work hard when they were on the farm.
4. This camera is not as expensive than I thought at first.
5. Listen to the boy! He is sing an international song on T.V
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