1. He is going to the post office………….. he wants to send a letter.
A. because B. but C. and D. moreover

2. She bought potatoes………….. cabbage at the market.
A. although B. and C. however D. but

3. They learn English………….. they intend to go abroad.
A. and B. or C. so D. because

4. His hobbies are playing soccer………….. collecting stamps.
A. and B. but C. however D. although

5. I'd love to play volleyball………….. I must complete my homework.
A. since B. moreover C. but D. and

--energy – money – electricity – machines – by – save – how much – in--

 For most North American households, lighting accounts for 10 percent to 15 percent of the (54)_______ bill. However, this amount can be reduced (55)_______ replacing an ordinary 110-watt light bulb with an (56)_______ saving bulb. These bulbs use a quarter of the electricity of standard bulbs and last eight times longer. Therefore, consumers can (57)_______ about US$ 7 to $21 per bulb.

In Europe, there is a labeling scheme for refrigerators, freezers, washing (58)_______ and tumble dryers. The label tells the consumers (59)_______ energy efficient each model is, compared with other appliances (60)_______the same category.

Ultimately, these innovations will save (61)_______ as well as conserving the Earth’s resources. 

1. He is going to the post office………….. he wants to send a letter.
A. because B. but C. and D. moreover

2. She bought potatoes………….. cabbage at the market.
A. although B. and C. however D. but

3. They learn English………….. they intend to go abroad.
A. and B. or C. so D. because

4. His hobbies are playing soccer………….. collecting stamps.
A. and B. but C. however D. although

5. I'd love to play volleyball………….. I must complete my homework.
A. since B. moreover C. but D. and

1. He is going to the post office………….. he wants to send a letter.
A. because B. but C. and D. moreover

2. She bought potatoes………….. cabbage at the market.
A. although B. and C. however D. but

3. They learn English………….. they intend to go abroad.
A. and B. or C. so D. because

4. His hobbies are playing soccer………….. collecting stamps.
A. and B. but C. however D. although

5. I'd love to play volleyball………….. I must complete my homework.
A. since B. moreover C. but D. and

6. I wear hat………….. I don't want to be sick.
A. because B. but C. therefore D. and

7. I am going to the supermarket………….. I want to buy some food.
A. therefore B. because C. but D. however

8. Do you want to have coffee………….. tea?
A. and B. or C. although D. but

9. She studies well………….. she is busy.
A. because B. since C. although D. and

10. They went to school………….. it was raining hard.
A. however B. and C. therefore D. although

1. He is going to the post office………….. he wants to send a letter.
A. because B. but C. and D. moreover

2. She bought potatoes………….. cabbage at the market.
A. although B. and C. however D. but

3. They learn English………….. they intend to go abroad.
A. and B. or C. so D. because

4. His hobbies are playing soccer………….. collecting stamps.
A. and B. but C. however D. although

5. I'd love to play volleyball………….. I must complete my homework.
A. since B. moreover C. but D. and

6. I wear hat………….. I don't want to be sick.
A. because B. but C. therefore D. and

7. I am going to the supermarket………….. I want to buy some food.
A. therefore B. because C. but D. however

8. Do you want to have coffee………….. tea?
A. and B. or C. although D. but

9. She studies well………….. she is busy.
A. because B. since C. although D. and

10. They went to school………….. it was raining hard.
A. however B. and C. therefore D. although

1. He is going to the post office………….. he wants to send a letter.
A. because B. but C. and D. moreover

2. She bought potatoes………….. cabbage at the market.
A. although B. and C. however D. but

3. They learn English………….. they intend to go abroad.
A. and B. or C. so D. because

4. His hobbies are playing soccer………….. collecting stamps.
A. and B. but C. however D. although

5. I'd love to play volleyball………….. I must complete my homework.
A. since B. moreover C. but D. and

6. I wear hat………….. I don't want to be sick.
A. because B. but C. therefore D. and

7. I am going to the supermarket………….. I want to buy some food.
A. therefore B. because C. but D. however

8. Do you want to have coffee………….. tea?
A. and B. or C. although D. but

9. She studies well………….. she is busy.
A. because B. since C. although D. and

10. They went to school………….. it was raining hard.
A. however B. and C. therefore D. although

1. She is very tired; ………….., she has to finish her homework.
A. moreover B. so C. and D. however

2. Is he an actor………….. a singer? An actor.
A. and B. or C. with D. so

3. He was tired, ………….. he took a rest before continuing the work.
A. so B. and C. but D. if

4. She forgot………….. off the gas before going out.
A. turn B. turning C. to turn D. turned

5. I suggest ………….. money for the poor people in our neighborhood.
A. save B. to save C. saving D. saved

6. Who looks ………….. your children when you are away from home?
A. for B. at C. after D. to

7. Why doesn't she go………….. with her university study?
A. in B. at C. to D. on

8. After coming home, she cleaned the floor………….. cooked dinner.
A. but B. however C. moreover D. and

9. They didn't understand the matter; ………….., they didn't ask for help.
A. but B. however C. moreover D. and

10. He got wet………….. he forgot his umbrella.
A. because of B. because C. but D. and

1. Scientists are looking for an………….. way to reduce energy consumption
A. effect B. effection C. effective D. effectively

2. We can………….. easily in the daylight.
A. to read B. reading C. readed D. read

3. She won't take all these suitcases………….. she likes to travel light.
A. so B. but C. because D. therefore

4. They are completely short of water now. A number of people have died because of this …
A. shortage B. short C. shorten D. shortly

5. What can we do to spend less………….. lighting?
A. in B. on C. about D. of

1. Can you turn ………….. the light? It's too dark.
A. on B. off C. in D. for

2. What are you looking …………..? . My picture book. I've lost it.
A. on B. off C. in D. for

3. There are…………saving methods and inventions to use solar energy.
A. energetic B. energize C. energy D. energetics

4. I had to pay much money this month for the international ……………
A. calls B. calling C. to call D. called

5. A new air-conditioner will be………….. this morning.
A. to install B. installed C. installing D. install

a. Máy biến thế hoạt động dựa trên hiện tượng vật lý nào ?
b. Một máy biến thế có số vòng dây các cuộn là 2000 vòng và 50000 vòng. Nếu dùng mấy biến thế trên làm giảm hiệu điện thế thì phải mắc cuộn dây nào vào nguồn điện xoay chều?