Замените формы глаголов indefinite active формами глаголов indefinite passive. 1.my relatives often spend much time together. 2.he usually teaches mathematics at school. 3.they visited a museum last sunday. 4.helen will meet her friend near the university tomorrow. 5.i will introduce my new friends to the parents tomorrow. 6.people set up a custom-house for the examination of foreign goods in 1749. 7.the fortress replaced the custom-house in 1761. 8.the inhabitants usually nickname the don river as "father don". 9.people always call rostov-on-don the gateway to the caucasus. 10.they will restore that church next year.

1. much time is spent together by my family.

2. the mathematics is usually tought at school by him.

3. a museum was visited by them last sunday.

4. helen's friend will be met at the university tomorrow by her.

5. my new friends will be introduced to my parents tomorrow by me.

6. a custom - house was set up for the examination of foreign goods in 1749 by the people.

7. the custom-house was replaced by the fortress in 1761. 8. the don river is usually nicknamed as "father don" by the inhabitants.

9. rostov-on-don is always called the gateway to the caucasus by the people.

10. that church will be restored next year by them.

1. It's wrong to burn trees! We need them!

2. Rubbish in the river can pollute the fish.

3. It's bad for the environment to reuse plastic bags.

4. We sometimes recycled plastic cartons. We put small plants in them.

5. It's important to recycle more paper and glass.

Объяснение: