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Bài 2: Tìm khối lượng mol cúa các khí A, B trong các trường hợp sau:
a. Biết tỉ khối của khí A đối với H2 bằng 23.
b. Biết tỉ khối của khí B đối với O2 bằng 1,375.
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Bài 1: Tính tỉ khối của:
a. Khí chlorine đối với khí hydrogen.
b. Khí nitrogen đối với khí carbon dioxide.
c. Khí oxygen đối với không khí.
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 Can I leave the ________________ of the tables to you?                                     (arrange) He and his ________________ hung around shopping malls and city streets.     (assist)You should ________________ listen to the pool lifeguards.                              (careful)You must put all the ________________ in a cupboard.                                      (chemistry)My new shoes are very ________________, they make my feet hurt.                  (comfort)We are living ________________ in our new apartment because

th neighbors usually turn on the TV loudly during the day.                                (comfort)

All sports shoes are designed for ________________.                                         (comfortably)This river is very ________________ for swimmers.                                            (danger)    The kitchen can be a ________________ place for children.                                (danger)You have to keep all ________________ objects out of the children’s reach.     (danger)Brenda wanted to ________________ her sympathy in a practical way.             (demonstration)Each year, fire ________________ homes and injures children.                           (destroy)Don’t leave the light on. It wastes ________________.                                       (electric)Be careful! ________________ can kill.                                                               (electrical)There was an ________________ of paintings at the Art Gallery.                       (exhibit)He demonstrated his invention to the public at countless ________________.    (exhibit)________________, I can’t make it.                                                                     (fortunate)People in my country are very warm and ________________.                             (friend)I don’t like Jane. She is unkind and ________________.                                     (friend)It was ________________ of him to offer to pay for us both.                             (generosity)Little Star is a ________________ teacher.                                                           (humor)Nam’s parents are pleased with his good ________________.                             (improve)Mr. The teacher is pleased with the ________________ in my study.                  (improve)Alexander Graham Bell was the ________________ of the telephone.               (invent)Bell demonstrated his ________________ at a lot of exhibitions.                        (invent)The world changed rapidly after the ________________ of the telephone.         (invent)________________, he passed the exam.                                                              (luck)A fairy ________________ changed Little Pea’s rags into beautiful clothes.      (magic)______________, a fairy appeared and changed her rags into beautiful clothes. (magical)She enjoys the ________________ atmosphere of the local library.                     (peace)His ________________ of some words is not correct.                                          (pronounce)Can you tell me how to ________________ this word?                                       (pronunciation)It is not _____________ to play with scissors, knives and small round objects.   (safely)It’s ________________ to leave medicine around the house.                               (safety)Chris will call when he has arrived ________________.                                       (safety)Bell started experimenting with ways of transmitting ________________

over a long distance.                                                                                               (speak)

He ________________ completed his experiment.                                               (success)My family wear ________________ clothes at Tet.                                              (tradition)________________, the villagers put on new clothes to attend the festival.        (tradition)The organization is asking for more ­­­­­­­­_____________ to help with its activities.   (voluntary)
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 Can I leave the ________________ of the tables to you?                                     (arrange) He and his ________________ hung around shopping malls and city streets.     (assist)You should ________________ listen to the pool lifeguards.                              (careful)You must put all the ________________ in a cupboard.                                      (chemistry)My new shoes are very ________________, they make my feet hurt.                  (comfort)We are living ________________ in our new apartment because

the neighbors usually turn on the TV loudly during the day.                                (comfort)

All sports shoes are designed for ________________.                                         (comfortably)This river is very ________________ for swimmers.                                            (danger)    The kitchen can be a ________________ place for children.                                (danger)You have to keep all ________________ objects out of the children’s reach.     (danger)Brenda wanted to ________________ her sympathy in a practical way.             (demonstration)Each year, fire ________________ homes and injures children.                           (destroy)Don’t leave the light on. It wastes ________________.                                       (electric)Be careful! ________________ can kill.                                                               (electrical)There was an ________________ of paintings at the Art Gallery.                       (exhibit)He demonstrated his invention to the public at countless ________________.    (exhibit)________________, I can’t make it.                                                                     (fortunate)People in my country are very warm and ________________.                             (friend)I don’t like Jane. She is unkind and ________________.                                     (friend)It was ________________ of him to offer to pay for us both.                             (generosity)Little Star is a ________________ teacher.                                                           (humor)Nam’s parents are pleased with his good ________________.                             (improve)Mr. The teacher is pleased with the ________________ in my study.                  (improve)Alexander Graham Bell was the ________________ of the telephone.               (invent)Bell demonstrated his ________________ at a lot of exhibitions.                        (invent)The world changed rapidly after the ________________ of the telephone.         (invent)________________, he passed the exam.                                                              (luck)A fairy ________________ changed Little Pea’s rags into beautiful clothes.      (magic)______________, a fairy appeared and changed her rags into beautiful clothes. (magical)She enjoys the ________________ atmosphere of the local library.                     (peace)His ________________ of some words is not correct.                                          (pronounce)Can you tell me how to ________________ this word?                                       (pronunciation)It is not _____________ to play with scissors, knives and small round objects.   (safely)It’s ________________ to leave medicine around the house.                               (safety)Chris will call when he has arrived ________________.                                       (safety)Bell started experimenting with ways of transmitting ________________

over a long distance.                                                                                               (speak)

He ________________ completed his experiment.                                               (success)My family wear ________________ clothes at Tet.                                              (tradition)________________, the villagers put on new clothes to attend the festival.        (tradition)The organization is asking for more ­­­­­­­­_____________ to help with its activities.   (voluntary)
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Minh is very tall. He can play basketball.

® Minh is ........................................................................................................

Lan isn’t tall. She can’t reach that shelf.

® Lan isn’t ......................................................................................................

Mai is twenty. She can get married.

® She is ...........................................................................................................

The weather is cold. They can’t go fishing.

® The weather .................................................................................................

The bed was comfortable so I slept very soundly.

® The bed was ................................................................................................

Lien is too young to drive a car.

® She isn’t .......................................................................................................

The test was too difficult for them to do.

® The test wasn’t .............................................................................................

The coffee was too hot for me to drink.

® The coffee wasn’t ........................................................................................