Ответ:
1.We should take advantage (b) of the hot weather and go to the beach.
2.We had really thick fog (a) this morning.
3.Australia is a main supplier (c) of energy.
4.He never takes care (c) of what other people say. He’s very stubborn
5.This part of the city is very polluted (b).There’s too much traffic
6.It’s a British company, but it exports (c) a lot of things to Germany.
7.There are a lot of cultural and educational institutions (b) in our country.