1.I suggest using gas instead of burning coal.

2.How about playing badminton?

3.Shall we buy energy-saving bulbs?

4.Why don't we use electricity economically?

5.I suggest you ask her yourself.

6.I suggest our class should be decorated again.

7.I suggest a charity event should be organized to raise money.

8.What about using that helmet to protect our head?

9.I suggest a cultural festival should be organized to celebrate Lunar New Year.

10.What about collecting unused clothes for the victims?

II.

1.I suggest using gas instead of burning coal.

2.How about playing badminton?

3.Shall we buy energy-saving bulbs?

4.Why don't we use electricity economically?

5.I suggest you should ask her yourself.

6.I suggest our classroom should be decorated again.

7.I suggest a charity event should be organized to raise money.

8.What about using helmet to protect our head?

9.I suggest a cultural festival should be organized to celebrate Lunar New Year.

10.What about collecting unused clothes for the victims?