. Rewrite the sentences without changing the meaning
1. My father is older than my mother
→ My mother............is younger than my father.................
2. My father is older than my mother. My uncle is older than my father.
→ My uncle...............is oldest in my family........................
3. This sweater is thicker than that one.
→ That sweater is........thickest..........
4. Her hair isn't long
→ Her........hair is short.............
5. It's necessary to arrive on time.
→ We................should arrive on time................
6. This exercise is easier than that one.
→ That exercise is more........difficult than this exercise..........
7. Students/must/keep/school/clean/beautiful.(Complete the sentence)
=> students must keep our school clean and beautifully