Question

ПОМОГИТЕ!II. Complete the sentences with the appropriate modal verbs (must, can, mustn’t, should ) :
1. We ________ care about our planet.
2. We ________ pollute water and air with toxic wastes.
3. River water _________be used to generate hydroelectric power.
4. We _________ produce and use renewable energy much more widely.

Answer 1

1. must

2. mustn't

3. can

4. should