1. He is said to work for 16 hours a day. 
2. The boy is believed to be wearing a white T-shirt and blue jeans. 
3. Mike was thought to have paid too much.
4. The portrait is known to have been painted by Picasso. 
5. The company is reported to go bankrupt. 
6. She is said to have lived here for 10 years. 
7. The criminal is thought to be hiding in the London area by the police. 
8. The building is reported to have been damaged by fire.
9. There is said to be a secreat tunnel between them. 
10. The thieves are believed to get in through the kitchen window 

1) -The shiet is not big enough for me to wear 
    -The shirt is so small that I can not wear it 
    -It is such a small shirt that i can not wear 
2) -The exercise was too difficult for me to do 
    -The exercises are not easy enough for me to do 
    -They are such difficult questions that I can't do 
3) -The water was too hot for him to drink 
    -The water was not cool enough for him to drink 
    -The water was so hot that he couldn't drink 
4) He is too weak to carry this table 

1. opened 
2. had discussed 
3. have heard 
4. will talk 
5. will not hear 
6. will repeat 
7. was trying 
8. argue 
9. meets 
10. have 

Con lắc lò xo treo thẳng đứng, độ cứng k = 80 N/m, vật nặng khối lượng m = 200 g dao động điều hòa theo phương thẳng đứng với biên độ A = 5 cm, lấy g = 10 m/s². Trong một chu kì T, thời gian lò xo giãn là