a, 1

b, 1 hoặc 2

c, 10

1. B => take

2. B => bought

3. was => were

4. C => didn't

5. D => weren't

B

Diện tích tam giác vuông là:

\(\dfrac{3,5\times2,6}{2}=4,55\left(cm^2\right)\)

Đ/s

go - went : đi

work - worked: đi làm

repair - repaired: sửa chữa

swim - swam: bơi

run - ran : chạy

receive - received: nhận

dislike - disliked: không thích

watch - watched: xem 

show - showed: buổi biểu diễn, chỉ

write - wrote: viết

buy - bought: mua

send - sent: gửi

speak - spoke: nói

make - made: làm

invite - invited: mời

introduce - introduced: giới thiệu

drink - drank: uống ( nước,... )

draw - drew: vẽ

play - played: chơi

learn - learned: học

study - studied: học

do - did: làm

D

Ah, vâng. Cảm ơn chị ạ :))

Chị ơi, câu 3 bị sai ạ

Do you live in Hoa An town?

II. Make questions for the underlined words

1. There is a flower garden behind the house

……What is behind the house? …………………………………………………………………………………

2. He’s living with his uncle and aunt in Hanoi

........Who is he living with?.............................................................................................................................

3. No. We don’t live in Hoa An town

............Do you live in Hoa An town..........................................................................................................................

4. Mrs. Lien’s class ends at half past eleven

......What time does Mrs. Lien's class end?................................................................................................................................

5. Our street had two shops last year.

......How many shops did your street have last year?................................................................................................................................

6. They have Math on Monday, Wednesday and Friday .

………When do they have Math?……………………………………………………………………………….

\(\dfrac{4}{6}=\dfrac{2}{3};\dfrac{12}{8}=\dfrac{3}{2};\dfrac{15}{25}=\dfrac{3}{5};\dfrac{11}{12}tối.giản;\dfrac{36}{10}=\dfrac{18}{5};\dfrac{75}{36}=\dfrac{25}{12}\)