Phần 3:

1.How about going by bikes instead of by motorbikes?

2.As Lan hasn't eaten all day, she is hungry.

3.If people didn't throw a lot of trash onto he water, it wouldn't be seriously polluted.

4.Raw sewage is pumped directly into the sea.

Phần 4:

1. I think (that) you should go to school by bus.

2. She wanted to go home because she felt sick.

3. If the pollution goes on, the world will end up like a second-hand junk-yard.

4. He is a careful driver. He drives car carefully.

$Answered$ $by$ $Mai$ $Chi$$.$

@Bơ Bơ

Phần 3:

1. How about going to school by bikes instead of by motorbikes?

2. As lan has not eaten all day, she is hungry.

3. If people throw a lot of trash onto the water, it will seriously polluted.

4. Raw sewage is pumped directly into the sea.

Phần 4:

1. I think you should go to school by bus.

2. She wanted to go home because she fell sick.

3. If pollution continues to go on, world will end up like a second hand junk yard.

4. He is a careful driver. He drives car carefully.

** Có vài câu em ko chắc lắm ạ.