Chọn từ đúng và giải thích tại sao lại chọn đáp án đó

Chọn từ đúng và giải thích tại sao lại chọn đáp án đó
Ví dụ:Question 17: Binb: _______ do you have English classes?
Mai: On Tuesdays, Thursdays and Saturdays.
A. Who
B. What
C. Where
D.When
-Vì on tuesdays,thursdays and saturdays chỉ thời gian => D.when
Câu 1: The novel is about a family who can't ________ with each other.

A.was
B.were
C.has been
D.have been
2. I _______ an English speaking club last week. It's great fun.
A. join
B. was join
C. am join
D.joined
3. It is hopeful that the pollution problems will _______ soon.
A. be solve
B. solved
C. be solved
D.solves
4. You don't like that shirt, _______ you?
A. won't
B. don't
C. will
D.do
5. To save money, I buy clothes ______ are on sale.
A. they
B. it
C. who
D.which
7. We need cars to travel; ______, we can walk or bike to reduce air pollution.
A. however
B. therefore
C.because
D.so
12. I am very happy to accept your ______.
A. invite
B. invites
C. invitation
D. invited
13. The party was ______ organized.
A. caring
B. cares
C. carefulited
D.carefully
18. You like football, ______?
A. are you
B. aren’t you
C. do you
D.don’t you
19. Phu Quoc is the ______ island that I have ever visited.
A. beautiful
B. most beautiful
C. more beautiful
D.as beautiful
20. We bought this hand- embroidered picture ______ it was expensivebeautiful
A. despite
B. although
C. because of
D.because
21. Caffeine is drug ______ can be addictive.
A. which
B. who
C.whom
D.whose