| I. Choose the right options to complete the sentences.

1 | Trees ★★★ in cities to reduce pollution.
A. should be planted | B. must plant | C. can't be planted | D. should plant

2 | Plastic bags ★★★ anymore. They harm the environment.
A. mustn't be used | B. should be used | C. could use | D. mustn't use

3 | Solar panels ★★★ be installed on the roof to save energy.
A. can | B. mustn't | C. shouldn't | D. can't

4 | People ★★★ forests. It destroys habitats.
A. mustn't be cut down | B. can be cut down | C. shouldn't cut down | D. must cut down

5 | Dirty water ★★★ into rivers.
A. should not be poured | B. should not pour | C. must be poured | D. must pour

6 | Global warming ★★★ any longer.
A. mustn't be ignored | B. should ignore | C. can be ignored | D. can't ignore

7 | More public transport ★★★ to reduce traffic pollution.
A. should be used | B. mustn't be used | C. can use | D. mustn't use

8 | We ★★★ clean drinking water for future use.
A. should be saved | B. mustn't save | C. can't be saved | D. should save