1. The test was difficult, so the students could not finish it in time

Because_______________

2. the street is narrow but crowded, so accidents usually happen

As_______________

3. The boy is too short to play basketball

Because___________

4. The test is rather easy, so we all can do it perfectly

As____________

5. The weather was so bad that the plane couldn't take off on time

Since____________

6. I left a message because you were out

You____________ 

7. He came to the meeting late because his car didn't work

His car______________

1. My sister tells stories interestingly

My sister is an____________

2. The children are active students

My children _____________

3. My sister is very clever at making toys from recycled things.

My sister can __________

4. The children play soccer skillfully.

The children are ___________________

5. My brother is not as good at playing soccer as my uncle.

My brother plays_______________

1. Mr. Liam is a good English teacher.

Mr. Liam__________

2. Miss Linda is a careless typist.

Miss Linda ____________

3. My friends are fast swimmers.

My friends__________

4. They are not good at playing chess.

They______________

5. The students are not bad singers.

They____________

so sánh độ hoạt động của Cu, Al, Fe

Phản ứng của Al với O2

 - Hiện tượng quan sát được, viết PTHH xảy ra.

 - Kết luận về TCHH của AL