Ответ:

Grammar rules are always learned (или learnt в британском английском) by heart

Rare animals are protected in many countries

This place is crowded on Sunday

I am invited to the concert

The classroom is cleaned everyday

Potatoes are grown in many countries

We are given textbooks at school

Many houses are built in our town every year

1)Grammar rules are always learned by heart

2) Rare animals are protected in many countries

3) This place is crowded on Sunday

4) I am invited to the concert

5) The classroom is cleaned every day

6) Potatoes are grown in many countries

7) We are given textbooks at school

8) Many houses are built on our town every year.