1. Tom got bad marks because he was very lazy.

2. The weather is nice, so we can go shopping.

3. The train was late since the fog was thick

The fog was thick, so the train was late.

4. She stays at home as her mother a sick.

5. These was the most becasue Mary can't sleep

Mary can't sleep, so these was the most.

=>

1. Tom got bad marks because he was very lazy.

2. The weather is nice, so we can go camping.

3.

- The train was late since the fog was thick.

- The fog was thick, so the train was late. 

4. As her mother is sick, she stays at home.

5.

- Because these were the most, she can't sleep.

- These were the most, so she can't sleep.

(Bạn xem lại đề câu 5, đề có lỗi đó ạ)