Ответ:

2. His class didn't go camping last year.

3. They didn't put the tent near a river.

4. My brother didn't wash up after dinner.

5. I didn't  swim in the sea last summer.

6. The mosquitoes didn't bite the children last night.

7. They didn't sleep in tent.

8. My parentes didn't enjoy their last holliday.

2.took

3.boots

4.have

5.up

6.enjoy

4) His class didn't go camping last year. They didn't put up the tent near a river. My brother didn't wash up after dinner. I didn't dwim in the sea last summer. The mosquitoes didn't bite the childern last night. They didn't sleep in tents. My parents didn't enhoy their last holiday.

5) took, boots, have, up, enjoy