Bài 9: Một người đi xe đạp xuống một đoạn đường dốc dài 120 m hết 30 s. Khi hết dốc, xe lăn tiếp một quãng đường nằm ngang dài 60 m trong 24 s rồi từng lại. Tính vận tốc trung bình của xe trên quãng dường dốc, trên quãng đường nằm ngang và trên cả hai quãng đường.

II.Complete these sentences with the suitable words (a, b or c) (2,0 pts)

1. I'll see you .......................................... Monday

   A. in              B. on                 C. at             D. after.

2. They have .............................. soccer here since 2010

  A. play            B. played           C. playing    D. to play

3. ......................... she do homework last night ?

 A. Did              B. do                C. Does        D. Are

4.............is a large piece of furniture where you can hang your clothes.

A. Wardrobe          B. Refrigerator       C. Desk                  D. Counter

5. Alec said to ..........that he was lucky to be alive.

A. he                      B. his                     C. himself              D. myself

6. Children..........drink milk every day. - It is good for them.

A. must                  B. ought                 C. don't have to      D. must not

7. I think Angela .........to buy that coat, it is really lovely.

A. must                  B. ought                 C. should               D. have

8. We'll go swimming today...............it's hot.

A. so                      B. because             C. so that               D. then

I. Find the word which has a different sound in the part underlined.( 1,0 pts )

A. beneath         B. scissors              C. wardrobe           D. cover

A. frying                B. towel                 C. socket                D. include

A. chemical            B. precaution         C. electric               D. destruction

A. remember          B. dangerous         C. vegetable           D. opposite

b. (x + 8)² – 2(x +8)(x -2) + (x -2)²

c. x²(x – 4)(x + 4) – (x² + 1)(x²- 1)                 d. (x+1)(x² – x + 1) – (x – 1)(x² +x +1)