X. Complete each of the following sentences in such a way that it means exactly the same as the sentence printed before it. (1,0 pt)

1. Students don’t  have to wear forage-caps on Monday mornings.

-> It isn’t ..........................................................................................................................

2. It is nearly ten years since I last saw her.

-> I have………………………………………………………………………………..

3. If we don’t save natural resouses, they will run out soon.

-> Unless we……………………………………………………………………………

4. Minh didn’t go to school last Saturday.

-> Minh was ………………………………..….…….…….

5. My mother spends two hours cooking a day.