Упр.122 Unit 1 2020 ГДЗ Enjoy English 11 класс

Choose the correct prepositions in brackets.

1. An alternative heating system was installed in addition to the existing one.
2. Representatives of local communities were engaged in the discussion of environmental problems.
3. The new traffic regulations will come into force next year.
4. Governments worldwide should deal with environmental issues.
5. Everyone should contribute to the solution of the problem.
6. We can’t solve the problem now for this simple reason: it requires time and investment.