1Having a hobby brings us joy and enriches our lives.

2We can discover a new hobby by trying something new and exploring the different activities that interest us.

3The best way to cultivate a new hobby is to try something new.

4 People have different interests and hobbies because everyone is unique

5 "It" refers to the hobby that we enjoy and are passionate about.

C

D

B

A

C

C

D

C

D

B

A

D

B

1Children in Vietnam dislike playing baseball in their free time.

2Most young students like to play folk games.

3How often do they visit their hometown?

4Do you prefer playing sports or board games?

5I don’t really enjoy doing extreme sports.

6I prefer designing clothes and bags.

d

b

b

b

a

23A

24B

25B

26D

27B

28C

29C

30B

Who got in touch to give you my name and my address ?

8 Guernica was being painted by Picasso at that time

9 The office has been cleaned by the cleaner

10 Three books had been written by him before 1867

11 We were happy to have met some interesting people

12 She is proud of being the leader of the group

13The little boy was afraid of jumping into the pool

14 It's unnecessary to bring your umbrella with you

15 It's interesting, so all of us want to visit the Citadel

Đổi: \(1dm^3=1.10^{-3}m^3\)

Thể tích của hợp kim gồm 2 chất trên là:

\(V=V_1+V_2\\ 10^{-3}=\dfrac{m_1}{D_1}+\dfrac{m_2}{D_2}\)

\(< =>10^{-3}=\dfrac{m_1}{10500}+\dfrac{m_2}{7300}\)

Mà \(m_1+m_2=9,85==>m_2=9,85-m_1\)

Thế vào PT trên ta được:

\(10^{-3}=\dfrac{m_1}{10500}+\dfrac{9,85-m_1}{7300}\)

Giải PT trên ta được: \(m_1\approx8,367\left(kg\right)\\ =>m_2=9,85-8,367=1,483\left(kg\right)\)

1 boring

2 clever

3 kind

4 hard-working

5 confident

6 friendly

7 shy 

8 talkative

9 funny

10 creative