9- were 

\(5\le5^x\le5^4\\ \Rightarrow x\in\left\{1;2;3;4\right\}\)

2- plays

running

Form : Be interested in + Ving 

1- like

2- don't like

3- speak

4- don't speak

5- watches

6- watch

7- doesn't watch

8- goes

9- go

10- don't go

11- are

12- arrive

13-arrives

14-doesn't like

15- don't like

16- go

17- goes

18- flies 

bị quê quá ;( 

1- Book was being read at 7o'clock yesterday morning

2- Television was  being broken at 9 o'clock last night

3- a song was being sung by Nina when you came 

4- While the house was being cleaned by Ms.NiNa , she hurt her back

 Form : O + was/ were + being + P(II)+(địa điểm)  + by..... +(thời gian) 

\(\left(x.30\right)+1335=31x\\ \Leftrightarrow30x-31x=1335\\ \Leftrightarrow-x=1335\\ \Rightarrow x=-1335\)

1- are having

2- plays 

3- eat

4- is watching

5- are reading

6- stayed

7- went

8- had

9- are

10- buy 

11- have

12- sent

13- flies

14- will travel 

15- are skipping

16- skipping

17-close

18- built

19-is sleeping 

20- has

21- love