1. Fossil fuels such as coal or oil are burned, so acid gases are produced. (so) => _____________________________________________. 2.  Noise pollution happens casue  the change in animals' living pattern. (causes) => _____________________________________________. 3. The Chernobyl nuclear accident happened. The area is uninhabitable. (made) => _____________________________________________. 4. The environment is polluted. Birds leave their habitats and plants die. (makes) => _____________________________________________. 5. The food is contaminated. People's health is poor. (results in) => _____________________________________________. 6. Factories release fumes. The air people breathe gets polluted. (due to) => _____________________________________________. 7. Plastic bags are a major source of waste. We should not throw plastic bags everywhere. (so) => _____________________________________________. 8. Because I am too poor, I cannot buy this house. ( Because of) => _____________________________________________. 9. Because the dress was so beautiful, I bought it. ( Because of) => _____________________________________________. 10. Acid rain is dangerous. Trees' leaves are damaged. (due to) => _____________________________________________. 11. Rain was so heavy that the streets were flooded. ( Because) => _____________________________________________. 12. He tried very hard. As a result, he passed a master’s degree. ( Because) => _____________________________________________. 13. This shirt is torn. Therefore, I take it for repairs. (since) => _____________________________________________. 14. Radioactive pollution is very dangerous. It can cause abnormal growth. (since) => _____________________________________________. 15. Leaves are damaged. The tree cannot get enough food energy to stay healthy. (because) => _____________________________________________

Tìm x
(2x+1)^2-(3x-2)^2=0

(x-3)(x^2+3x+9)+x^2(2-x)

1) Có 2 bình A và B. Bình A chứa nước bình B chứa xăng. Biết TLR của nước là 10000 N/m^3, của xăng là 7000 N/m^2. Cột nước trong bình A cao 70 cm.  a) Tính áp suất của cột nước gây lên đáy bình A.  b) Để áp suất ở đáy bình B bằng áp suất của cột nước gây lên ở đáy bình A thì cột xăng trong bình B phải có độ cao?

Chọn các cụm động từ tốt nhất cho các câu sau

He ( came up with/ came into/ went back) a solution.
Could you (point out/ find out/ turn out) what time we need to arrive?
Many children ( come up / come down/ come to) with an ear infection even before their first birthday.
Most people (get up/ get out/ get over) a cold within two weeks.
I can’t wait to (get back/ get off/ get rid of) that ugly old couch.
I can’t believe who (drop out/ dropped in/ come in) on us last night.
He couldn’t (get along with/ get well/ get over) his mother-in-law.
I guess we need to (go over/ go through/ go up) the whole song a few more times.
She is glad they (look up to/ look down on/ look for) her.
I’m sorry, but you can’t (makeup/ made by/ marked down) that test you missed.

I. Fill in the blank with a/an.

Question 1.  I’ve bought ______  umbrella for my sister. 

Question 2. My Tam is ____ famous singer in Vietnam.

Question 3.  Would you like ___ cup of tea?

Question 4.  I’d like ______ grapefruit and ______ orange juice. 

Question 5. It takes me ____ hour to go to the cinema. 

II. Fill in the blank with “a”, “an” or “the”

Question 6.    You can see ____ moon clearly in the Mid-Autumn festival.

Question 7.  Peter is ____ most hard-working student I’ve known.

Question 8.   She took ______ hamburger and _____ apple, but she didn’t eat _____ apple.

Question 9.    My grandfather sent me _____ letter and _____ gift but I haven’t received ____

Question 10.  We have ____ cat and ____ dog. _____ cat doesn’t get on well with ____ dog. 

III. Choose the best answer. 

Question 11.  Can you show me_____way to _______ station?

A. the-the       B. a-a               C. the-an              D. a-the

Question 12.  Mr. Smith is ___old customer and ___honest man.

A. an-the       B. the-an           C. an-an                      D. the-the       

Question 13.  Would you like to hear ____story about ___ English scientist?

A. an- the        B. the- the       C. a- the          D. a- an

Question 14.   There'll always be a conflict between ___old and ____young.

A. the- the       B. an-a             C. an- the        D. the- a

Question 15.  It is typical of the culture life of ____ Thai people.

A. some           B. a                           C. the                         D. an

Question 1. Do you know ______ language is spoken in Kenya?

A. Which        B. Who            C. What                      D. How

Question 2. - ______ do you play tennis?  - For exercise.

A. Why           B. Who           C. What                      D. How          

Question 3. _______ can buy some milk? - At the supermarket.

A. Which         B. Who            C. Where         D. How

Question 4.  ______  much do you weigh?

A. Which         B. Who            C. What          D. How

Question 5. _______hat is this? It’s my brother's.

A. Which         B. Whose        C. What          D. How

Question 6.  ______  bags are you carrying? – Judy’s.

A. Which             B. What              C. Who’s                     D. Whose

Question 7.  _______ usually gets up the earliest in your family.

A. Which            B. Who                C. What                      D. How

Question 8.   _____ money do you earn? – About 500$ a month.

A. How much             B. What          C. How many             D. Which

Question 9. _____ do you expect to have the work completed?

A. When                      B. What       C. Who                       D. How far

Question 10. _____ do you go shopping?

A. How long         B. How often       C. How many      D. How much

Question 11.  _______ does your English teacher look like? She’s young and pretty.

A. What          B. How           C. Where         D. Who

Question 12.  

Lan: _________does a Yao kid never wander through?

Mai: A Yao kid never wanders through the woods.

A. Where         B. What          C. Who                       D. When

Question 13.  _____ do the people here erect their stilt house? – They use columns and beams to build them.

A. How           B. When          C. What           D. Where

Question 14.  I often eat sticky rice cake, but I don’t know _____ make it.

A. how to       B. what to        C. how           D. what

Question 15.  ____ is the most important festival in Vietnam?

A. Which                     B. What                       C. When          D. Where

Question 1. The teacher asked me to speak _______.

A. loud            B. louder         C. more loud  

Question 2. Today you looks_______ than usual.

A. more confident     B. more confidently                C. confidently                       

Question 3. You have to work________ if you want to succeed.

A. more hardly            B. hardlier       C. harder

Question 4. You need to work ________ , or you will make a lot of mistakes.

A. more careful           B. more carefully        C. carefully

Question 5. Your house is decorated _________ than mine.

A. more beautiful        B. more beautifully     C. beautifully

Question 6. City drivers have to drive ______ than country ones.

A. more careful                       B. more careless                     

C. more carefully                    D. more carelessly 

Question 7.  I can’t understand what you are saying. Could you speak _______?

A. slowly     B.  less slowly     C. more slowly       D. most slowly

Question 8.  They live _______ with their family in a small cottage.

A. happy      B. happily           C. unhappy           D. happiness

Question 9.  Mr. Brown arrived ________ than expected.

A. more early              B. earlier          C. late             D. more late

Question 10.  We walked______ than the rest of the people.

A. more slowlier         B. slowlier          C. more slowly       D. more fast   

Question 11.  My mother talked _______ than the other guests.

A. more loudly            B. loudlier

C. more loudlier          D. loudly        

Question 12. I went home _______ this afternoon.

A. more late    B. later            C. more early  D. more earlier                      

Question 13. Jim jumped __________ than Peter.

A. more fartherly        B. far   C. farther        D. farrer

Question 14. Minh always answers questions ______ than the other students.

A. weller         B. good           C. better          D. goodly

Question 15. Our new teacher explains the exercises ________ than our old one.

A. more badly                         B. bad             C. badder        D. worse