It___ today so we can't go out

Mọi người làm giúp em với ạ, mọi người ghi rõ cho em VD 1. A - Thì hiện tại đơn, tại sao nhận ra được câu đó là THÌ HIỆN TẠI ĐƠN giúp em ạ, cảm ơn mọi người nhiều ạ, mong mọi người giúp em như em nói ạ 
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Câu 0: It
today so we can't go out.
A. rains B. rain C. rained
to the cinema with sister last night.
B. goes
D. had rained
1. 1
A. go
2. When I was out, I suddenly remembered that I
A. forget
3. When my father was in his 30s, he
A. worked
my
D. had gone
C. went
to turn off the gas stove.
B. forgot C. has forget D. had forgot
extremely hard.
B. works
C. work D. had worked.
4. By the time she got married, she
B. had
a child.
A. had had
C. have D. has
5. I had waited for you two hours by the time you
B. had come
A. come
С. comes
D. camej
hot for months, it started to be cool last week.
B. is
to Alice when he was 28,
B. married
around the earth.
6.
After it
A. was
C. had been
D. were
7.
Не
He
C. marry
D. had married
A. marries
8. The moon
A. go
9. Before he went to Vietnam, he
A. hadn't traveled
C. doesn't travel
10. They
A. traveled
11. David is very lazy as he
A. never studies B. never studied C. study always D always studies
12. Christopher Columbus
A. discovered
D. had gone
by bicycle.
B. went
C. goes
B. hasn't traveled
D. wasn't traveling
by motorbike most of the time because they are shippers.
B. travels
C. are traveling D. travel
American more than 500 years ago.
B. has discovered
D. discovers
as private tutors in HCM city nowadays.
C. had discovered
Many students
B. worked
13.
A. works
Pronunciation:
14. A. bad
15. A. cat
16. A. we
C. had worked D. work
B. sad
B. hat
B. men
C. farm
C hand
C. get
D. sand
D. dark
D. never