1 D 

2 A

3 B

4 A

5 C

6 D

7 A

8 C

9 A

10 D

I. Exercise1: Hãy chọn phương án thích hợp để điền vào chỗ trống.

1. This is…………..…my…... (my/I) book and that is………your... (your/ you) book.

2. Music is…………my….……..(I/ my) favorite subject.

3……I…(I/ My) want to be a teacher and…my.. (my/ me) sister wants to be a doctor.

4. Mai likes English but……………her……….. (her/ she) brother doesn’t.

5. They ………are………(is / are) very nice and friendly.

б. Hoa’s pencil case …is….(is/ are) blue.  (Her/ She) …her…friends’ pencil cases are violet.

7.Those students……are…….( are / is) very heavy.

8. What is………your…. (your/ you) father’s job?...........he.......(He/ His) is an engineer.

9. How old……is…. (are/ is)…your… (your/ you) sister…she…(She/ Her) is ten years old

10. These are my sister room. (They/it) They are very nice

1. getting
2. cooks
3. is playing
4. will come
5. is going to rain
6. to look
7. to pay
8. watch

a. is opened

b. was being pulled down

c. had been cleaned

d. Has the rubbish been collected

I went to+place

đề bài đâu hả bạn ?

\(sin^2x+cos^2x=1\)

=>\(cos^2x=1-\left(\dfrac{2}{3}\right)^2=1-\dfrac{4}{9}=\dfrac{5}{9}\)

mà \(cosx>0\)(Vì \(x\in\left(0;\dfrac{\Omega}{2}\right)\))

nên \(cosx=\sqrt{\dfrac{5}{9}}=\dfrac{\sqrt{5}}{3}\)