a, Vì Om là tia phân giác của góc xOy

\(\Rightarrow\widehat{xOm}=\widehat{yOm}=\dfrac{\widehat{xOy}}{2}=\dfrac{70}{2}=35^o\)

b, Tc: \(\widehat{xOy}+\widehat{nOy}=180^o\) (kề bù)

\(\Rightarrow\widehat{nOy}=180^o-\widehat{xOy}=180^o-70^o=110^o\)

\(\Rightarrow\widehat{mOn}=\widehat{mOy}+\widehat{nOy}=35+110=145^o\)

\(\Leftrightarrow\left[{}\begin{matrix}3x-21=0\\43-x=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=7\\x=43\end{matrix}\right.\)

Vậy x = 7 hoặc x = 43

If you weren't lazy to learn lessons, you would get good marks

1 bad => worse

2 big => bigger

3 interesting => more interesting

4 pretty => prettier

5 friendly => friendlier/ more friendly

6 good => better

7 clean => cleaner

8 expensive => more expensive

I have no difficulty in getting up early in the morning

1 international

2 excited

3 equipments

4 boarding

5 classmates

6 uniforms

7 creative

1 is

2 are

3 is

4 are

5 are

6 Is - she isn't

7 Are - they aren't

8 Is - he is

9 Are - they aren't

10 Is - it is

1 is

2 works

3 study

4 isn't

5 don't drink

6 has

7 have

8 Does Hoa like cooking? 

=> Yes, she does

9 Is it 10:15 now?

=> No, it isn't

10 doesn't watch

1 He isn't eating ice cream at the moment

2 Are their friends playing games right now?

3 Where are you going now?

4 When is she singing this song?

5 I am not practicing dance at the present

6 You are buying something at the supermarket now

7 Linh's parents are preparing the breakfast for her now

8 What are the cats eating right now?

9 Look! Who is driving the red car at the moment?