1.Minh is very busy, _________ he can't go out with you. 
A. because B. but C. so D. and

Dịch nghĩa để chọn "so"
2.Mrs. Nga is living next to my apartment. ___________ husband is a teacher of Hung Vuong 
Secondary School 
A. Her B. My C. His C.Your

Phía trước là Mrs (cô) nên phía sau chắc chắn phải là Her
 3I___________ Lan in front the movie theater yesterday .  
A. see B. will see C. have seen D.saw

Yesterday ở phía sau=> động từ chia quá khứ

4. Trang wants___________ a nice shirt for her father. 
A.buy B.Buys C.To buy D.Buying

Want+toV
5.If people pollute the air, we ___________ breathing 
problem .
A. have B. has C. are having D. will have
If + S+V(hiện tại đơn), S+will+V (nguyên thể) câu đk loại 1 

6.___________ do they go to the zoo ? - Twice a
month. 
A. How often B. How C. How long D. how much 

Twice a month (tấn suất xảy ra)=> chon how often
7. Mai usually takes care___________ her younger
brother
A. at B. to C. of D. from

take care of : chăm sóc