`550 - (x + 20) = 100 : 2`

`=> 550 - (x + 20) = 50`

`=>           x + 20   = 550 - 50`

`=>          x + 20    = 500`

`=>          x             = 500 - 20`

`=>         x              = 480`

B

C

C

A

A

D

C

B

tìm từ để hoàn thành câu 

mary comes home at 3.00 and ....has.. lunch

tìm từ để hoàn thnahf câu

mary ....comes... home at 3.00 

đề bài lè j ?

17. The film was very boring. We left before the end.

`->`we left before the end of the movie because it was boring

1.A:I saw Brian a few day ago

B:Oh,did you?(What/he/do)......what did he do........these day

2.A:Psychology

B:(he/enjoy).......does he enjoy....it?

3.A:Hi,Liz.How(you/get/on)......did you get on.....In your new job

B:No bab.It's wasn't so good at first,but(things/get)......things get up...better now.

Vèw học bảng cửu trương ik 

`2x3=6                   2x5=10`

`3x3=9                   3x9=27`

`6x8=48                   6x3=18`

Put the words in the blanks into the correct forms.

16. Be quiet! The baby _sleeps__ (sleep).

17. Last weekend, our group _made__ (make) many pencil cases from plastic bottles.

18. We have our plan for the summer holiday. We _have joined__ (join) the 3Rs club to help the environment.

19. What is the _highest_ (high) mountian in the world?

20. If we ___ (protect) the forests, we _`ve_help_ (help) our planet.