1. I can't send her a postcard because I don't know her address                                             

=> If

2. Ann has a bad cold, so she can't go to the circus today                                             

=> If                                           

3. They don't clean the window that's why the room looks rather dark                             

=>If                                                 

4. Sue was ill, so she couldn't go to the party             

=> If                                             

5. They didn't have enough money therefore, they didn't buy the bigger house               

=> If                                                 

6. Mary was not injured in the crash because she was wearing a seat belt                         

=> If                                             

7. The bus didn't stop because you didn't put your hand up                                         

=> If

1. People speak English all over the world

=> English

2. We use computers to do our work nowadays

=> Computers

3. The mechanic is repairing Judy's car

=> Judy's car

4. The government is building a new hospital in my neighborhood

=> A new hospital

5. They ate all the food before we got to the party 

=> All the food

6. Tina drank a lot of tea this afternoon

=> A lot of tea

7. I was washing my clothes when you called

=> My clothes

8. The chief engineer was instructing all the workers of the plant

=> All the workers

1. If he doesn't study harder, he'll get bad marks

=> Unless

2. If it isn't raining, the crops will be lost

=> Unless

3. She won`t get over her illness if she doesn't take the pills

=> Unless

1. I can't send her a postcard because I don't know her address                                             => If

2. Ann has a bad cold, so she can't go to the circus today                                             => If                                           

3. They don't clean the window that's why the room looks rather dark                             

=>If                                                 

4. Sue was ill, so she couldn't go to the party             

=> If                                             

5. They didn't have enough money therefore, they didn't buy the bigger house               

=> If                                                 

6. Mary was not injured in the crash because she was wearing a seat belt                          => If                                             

7. The bus didn't stop because you didn't put your hand up                                         

=> If

1. I can`t send her a postcard because I don`t know her address

-> If

2. Ann has a bad cold, so she can`t go to the circus today

-> If

3. They don`t clean the window; that`s why the room looks rather dark

-> If

4. Sue was ill, so she couldn`t go to the party

-> If

5. They didn`t have enough money; therefore, they đin`t buy the bigger house

-> If

6. Mary was not injured in the crash because she was wearing a seat belt

-> If

7. The bus didn`t stop because you didn`t put your hand up

-> If

Một vật được ném lên độ cao 1m so với mặt đất với vận tốc đầu 2m/s. Biết khối lượng của vật bằng 0,5kg (Lấy g=10m/s²). Cơ năng của vật so với mặt đất bằng:

Câu 1: Cho 11,1 gam hỗn hợp X gồm Al và Zn tác dụng vừa đủ với V lít dung dịch HCl 1M thu được 5,04 lít khí hiđro (đktc)

a) Tính thành phần phần trăm khối lượng từng chất trong hỗn hợp X

b) Tính V

Câu 2: Để hòa tan hoàn toàn 3,07 gam hỗn hợp gồm Fe và Al cần dùng vừa đủ m gam dung dịch HCl 10% (D=1,05g/ml) thu được 1,456 lít khí (đktc)

a) Tính thành phần phần trăm khối lượng từng chất trong hỗn hợp đầu

b) Tính m