a, Đổi 100ml=0,1l

\(n\)H₂SO_{4=0,1.2=0,2mol}

Choose the most suitable word or phrase to complete each sentence. (10 pts)

6. My friend …………………. the answer to the question now.

A. is known B. know C. is knowing D. knows

7. Several people were hurt in the accident but only one ..................to the hospital.

A. has taken B. was taken C. was taking D. are taking

8. I’ve got my key. I found it when I …………………. for something else.

A. looked B. was looking C. looking D. have looked

9. Where ………………….?

A. do you often have your hair cut B. do you often cut your hair

C. do you often have cut your hair D. are you often cut your hair

10. I ........................to see you at the meeting. Why didn’t you come?

A. waited B. expected C. thought D. looked

11. All of us were ......................that he came first. He hasn’t been working hard so far.

A. surprising B. to surprise C. to be surprised D. surprised

12. Where is Janet? – She’s out. She said she ......................... back soon.

A. is B. will be C. would be D. came

13. I telephoned the station to make ......................of the time of the train.

A. true B. real C. right D. sure

14. At first I found ......................to get used to .....................on the other side of the road.

A. it difficult - drive B. difficult - drive

C. it difficult - driving D. difficult- driving

15. What a………………car!

A. new small nice B. new nice small C. nice new small D. nice small new

Nguyên sinh vật có cơ thể cấu tạo chỉ từ một tế bào chúng xuất hiện sớm trên hành tinh. Nguyên sinh vật phân bố ở khắp nơi:không khí, đất nước đặc biệt là trng cơ thể sinh vật

\(n_{dd1}=2.2=4mol\)

\(n_{dd2}=3.1,5=4,5mol\)

\(C_M=\dfrac{4+4,5}{2+3}=\dfrac{8,5}{5}=1,7M\)

Chúc bạn học tốt

Choose A,B,Cor D to complete the following sentences

1- My brother is studying hard ......................... pass the exam.

A. for B. in order to C. so to D. so that

2- We have studied ................... seven o'clock.

A. for B. at C. since D. to

3- He was born in England. English is his .................................

A. mother tongue B. first language

C. foreign language D. A and B are correct

4- It's dangerous .......................... in this river.

A. swim B. to swim C. swimming D. swam

5- ........................... to America yet ?

A. Were you B. Have you ever been C.Were you been D. Are you

6- The boy was ....................... by the dog

A. bite B. bit C. bited D. bitten

7- My father used ...................... me to school.

A. took B. taking C. to take D. take

8- Would you mind ................... for a few minutes?

A. to wait B. waiting C. wait D. be waiting

Chúc bạn học tốt

I. Choose the word (a, b, c, d) that best fits each of the blank spaces.

The amazon (1)______in a stream near the top of a mountain which (2)______Cerro Huagra. The stream is called the Huarco. (3)______the Huarco becomes a river which is known (4)_____the Ucayalli then becomes the Amazon. The (5)_____of the Amazon from the (6)______of the Huarco to the Atlantic Oean is 6,448 kilometers.

1. a. begin b. began c. begins d. is beginning

2. a. is called b. calls c. call d. is calling

3. a. Lace b. Lately c. Later d. Latest

4. a. as b. so c. like d. alike

5. a. long b. length c. wide d. narrow

6. a. begin b. starting c. start d. beginning

Chọn chất thích hợp điền vào trống và hoàn thành các phương trình hóa học sau:

a) H₂O + SO₃ -----> H₂SO₄

b) H₂O + CaO -----> Ca(OH)₂

c) Zn + HCl -----> ZnCl₂ + H₂