Explicación:
1. You must clean the floor carefully
2. the new secretary works very slowly
3. the student has been studying hard for the test
4. when he knew the news he smiled happily
5. my brother can do these exercises easily
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Explicación:
1. You must clean the floor carefully
2. the new secretary works very slowly
3. the student has been studying hard for the test
4. when he knew the news he smiled happily
5. my brother can do these exercises easily