Dùng kiến thức quán tính giải thik khi chiếc xe đạp xuống dốc mà phanh trước sẽ bị lộn xe.

1. If I (do)........... this test, I (improve)......... my English.

2. If I (find)............. your ring, I (give)............it back to you.

3. Peggy (go)................ shopping if she (have).............. time in the afternoon.

4. Simon (go)................ to London next week if he (get)..................a cheap flight.

5. If her boyfriend (phone/not).................. today, she (leave)............. him.

6. If they (study/not)................ today, she (leave)................ him.

7. If it (rain)................. tomorrow, I (have to/not)........... water the plants.

8. You (be able/not)............. to sleep if you (watch)............... this scary film.

9. Susan (can/move/not)............ into the new house if it (be/not)................ready on time.

1. If the local people drink the contaminated water, they (have)......................... health problems.

2. All the aquatic animals (die).................... if people don't stop dumping sewage into the lake.

3. If the sun (shine)................, we will walk to the mountain.

4. People use a lot of cars and motorcycles. If people (reduce)..................... the use of motor vehicles, there (be)............... less serious air pollution.

5. If you (not read)................... these articles, you (not know)............. the facts about water pollution.

6. If I (be)...................... the president, I (remove)............... all the factories out of the city.

7. Your brother (have)............... hearing problems if he (listen)................... to too loud music.

1. The girl with a shawl on her head is a member of the Thai.

2. We can find terraced fields in the northern mountainous regions.

A, an, hoặc the

1. The communal house is also used as ______ the place of worship.

2. Recently, Thai men prefer to wear _______ King's style of dress.

Điền mạo từ a, an, the

1. Among 54 ethnic groups in Viet Nam, the Odu group has ________ smallest popular

2. There is _______ stilt house in my grandparents village.