Một bóng đèn có ghi 6W_ 0.75A. Mắc bóng đèn này với một biến trở có điện trở lớn nhất là 16Ω và hiệu điện thế U= 12V.
a) Tìm giá trị của biến trở để đèn sáng bình thường khi đèn và biến trở mắc nối tiếp nhau.
b) Nếu mắc đèn và biến trở vào hiệu điện thế đã cho U= 12V
Giải giúp mình với
I. Rewrite these sentences:
1. They are strong. They can lift the table. (Adj + enough + to V)
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2. She isn't tall.She doesn't reach the shelf. ( not Adj + enough + to V)
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3. Lan has a new comic book and she hasn't homework tonight. (Be going to+V)
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4.They had new fishing rods yesterday.(Be going to+V)
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5.You shouldn't play computer games so much.
- You ought............................................................................... .
6. She is beautiful and interlligent.She can become Miss World.
-> (enough)................................................................... .
7. Dungf wrote his test very carelessly. So he could not get a high mark.
->(not enough)........................................................... .
8. The shirt is very dirty.She can not wear it.
-> (too)........................................................................ .
9. There are pans on the wall next to the sink.
-> The .................................................................................. .
10. the explanation is rather clear. We are undertand it.(Using "enough").
-> The explanation..................................................................... .
II. Write complete sentences with the given words:
1/ This/ Hoa's Kitchen.
...................................................................... .
2/ There / refrigerator/ right conner/ room.
................................................................. .
3/ Next to/ refrigerator/ stove and oven.
...................................................................... .
4/ On the other side/ oven / sink / next to/ sink / tower rack.
................................................................ .
5/ There / desk / table.
...................................................................... .
6/ He tall enough/ be/ good basketball player.
.................................................................................. .
7/ She / brown eyes/ long black hair.
.......................................................................... .
-------------------------------------Hepl me!!!----------------------------------------------------
**Someone** is helping the girl who falling over
I. Rewrite as directed.
1. Thanh is a fluent English speaker.
- Thanh speaks............................................... .
2. What's your weight?
- How................................................................. .
3. Hoa has a big breakfast. Nam has a big breakfast. (so)
- .................................................................................. .
4. He is a safe car driver.
- He drives................................................................ .
5.My teacher drives a car to school every day.
- My teacher goes........................................................... .
6. Tim is tha tallest in his family.
- No one in Tim's family............................................................. .
7. I spend two hours a day doing my homework.
- It takes................................................................ .
8. He is a slow and careful driver.
- He drives ..................................................................
9. They mustn't stay up late. You mustn't stay up late. ( neither)
- ........................................................................... .
10. Nam is a hard student
- Nam................................................................... .
II. Read the passage and then answer the question.
Yesterday was Hoa's thirteenth birthday. She had a small party with her friends. They ate a lot of fool, fruits and cakes. In the evening, Hoa had a stomachache. Her aunt was worried. She called a doctor. The dpctor arrived and gave Hoa some medicine. She took the medicine and went to bed. Today, Hoa feels doctor arrived and gave Hoa some medicine. She took the medicine and went to bed. Today, Hoa feels better.
1. When was Hoa's thirteenth birthday?
-........................................................................................... .
2. Why did Hoa have a stomachache?
-.......................................................................... .
3. Was her aunt worried?
-.................................................................................... .
4. Does Hoa feel better today?
-................................................................................ .
I. Write complete sentences:
1. Nga / mother / write / sick note / her / yesterday?
2. Linh / not go / school / last Wednesday / because / she have / bad cold.
3. You / shouldn't / eat / too / candies / because / they / not good / your teeth .
4. My father / have / stomachache / and / pain / chest / last year.
5. Students / fill / medical records / and / give / the nurse.
6. The nurse / measure / Hoa / height / weigh / her / the moment.
7. Mr. Lan / now wear / face mask / protect / him / dust.
8. Last semester / my class / there be / total / 98 day's / absence / due / sickness.
9. Last year / my brother / work / engineer / printing factory.
10. We / cold / 'common' / because / every year / millions / people / world / world / catch.
I. Rewrite the senterces, usingt suggestion:
1. Listening to music is much more interesting than going to the circus.
- I prefer.................................................................. .
2. He is a slower and more careful driver than Lan.
- He drives.............................................................. .
3. Phillip usually works hard.
- Phillip is............................................................... .
4. Can she take care of herself while her mother is away?
- Can she look.......................................................... ?
5. Where can I find the station ?
Could you .................................................................. ?
6. We took a train to Liverpool last Saturday.
- We went.................................................................... .
7. How about eating out tonight?
- Why don't we................................................................. .
8. He is a good soccer player.
- He plays....................................................................... .
9. He liked oranges more than durians.
- He preferred.................................................................... .
10. It is twenty five to five.
- It is............................................................................. .
11. She didn't go out last night. i didn't go out either. (Neither)
-............................................................................ .
12. She didn't stay up late. Her children didn't stay up late.( either)
- .......................................................................... .
13. She is very busy now. my mother is also very busy. (too)
- .......................................................................... .
14. The boys played badminton. the girls played badminton. (so)
-............................................................... .
II. Riwrite the sentences with compound adjectives.
1. Her daughter is ten years old.
- ........................................................... .
2. The rest lasts for fifteen minutes.
- ........................................................... .
3. The building has five floors.
- .............................................................. .
4. The book has two hundred pages.
- ................................................................. .
5. The test lasted for three hours.
- ................................................................... .
6. The course lasts for six mouths.
- .................................................................... .
7. The meal has three courses.
-........................................................................ .
8. The castle is one hundred years old.
- ......................................................................... .
9. The games has five grades.
- ............................................................................ .
10. The arcade has twenty rooms.
- ............................................................................... .
Complete the sentencer with correct form the words.
1. My grandfather is sixty years old. He walks very (slow).............
2. i saw an (excite)............... film on TV last night.
3. Are the toys (safely).......................for childen?
4. Ronaldo is a (skill).......... soccer player. He plays soocer very (skill)..............................
5. Playing soccer in the street is very (danger)........................
6. He speaks English very (quick).............., so T can't catch his words.
7. ....................... , (sudden) everyone tood up and shouted.
8. The children behaved very (good)....................