1. Keep silent or you’ll wake the baby up. →If YOU DON'T KEEP SILENT , YOU WILL WAKE THE BABY UP……………………………………………..…..………

2. Stop talking or you won’t understand the lesson.→ If ………YOU DON'T STOP TALKING , YOU WON'T UNDERSTAND THE LESSON…………………………….....….…….

3. I don’t know her number, so I don’t ring her up.→ If I KNEW THE NUMBER, I WOULD RING HER UP…………………………………….....….……..

4. I don’t know the answer, so I can’t tell you.→ If ……I KNEW THE ANSWER, I COULD TELL YOU……………………………………….………..

5. We got lost because we didn’t have a map.→ If ……………WE HAD ……………HAD A MAP, WE WOULDN'T HAVE GOT LOST………….……..…….……

6. Susan felt sick because she ate four cream cakes. →……IF SUSAN HADN'T EATTEN FOUR FCREAM , SHE WOULDN'T HAVE FELT SICK………………………………………..……

7. Without this treatment, the patient would have died. →…IF HE HADN'T RECEIVED THIS TREATMENT, THE PATIENT WOULD HAVE DIED…………………………………….….…...

8. He lost his job because he was late every day. →……IF HE HADN'T BEEN LATE EVERYDAY, HE WOULDN'T…HAVE LOST HIS JOB………………………………………...……

9. Peter is fat because he eats so many chips. →…………IF PETER DIDN'T EAT SO MANY CHIPS,HE WOULDN'T BE FAT…………………………………………...…..

10. Robert got a bad cough because he started smoking cigarettes. →………IF ROBERT HADN'T STARTED SMOKING CIGARETTES, HE WOULDN'T HAVE GOT A BAD COUGH………………………..…..

1. stared

2.watching

3.saw

4.playing

5.will be working

6.read/has been

7.was/went

8.has lived

Cơ thể đơn bào là những động vật có cấu trúc cơ thể chỉ là một tế bào, nhưng có đầy đủ chức năng của một đơn vị sống.
Ví dụ: Vi khuẩn, tảo lam, trùng giày, ...
Cơ thể đa bào là cơ thể được cấu tạo từ nhiều tế bào. Các tế bào khác nhau thực hiện các chức năng khác nhau trong cơ thể.
Ví dụ: Cây ổi, con rắn, cây lúa nước, ...

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