II/ BÀI TẬP VIẾT

Dear Mr. President,

I / write / you about / catching of fish / lake behind / house.

I / worried because they / not / use / fishing rod or net but use electricity / catch fish . After / short time they leave / lake , a lot / small fish died / float / water surface . Other animal such / frogs , toads ,/ even birds also die / from electric shock waves .

I / suggest / local authorities / prohibit / fine heavily anyone using this way / catching fish .

I / look forward to /hear/ you and see / the actions taken/ protect / environment / local authorities .

Sincerely,

Le Minh Phong

Correct the mistake in each sentence

16. What about put rubbish bins around the schoolyard?

a. what b. put c. rubbish bins d. around

17. The streets are wide enough for cars to move easy between lanes.

a. wide b. for c. to move d. easy

18. Our world will be better if people will care about what they do.

a. will be b. better c. will care d. do

19. If we work harder, we won’t finish it on time.

a. if b. work c. won’t finish d. on time

20. The earth is much hotter so people don’t know the way to protect it.

a. is b. so c. don’t know d. to protect

Bài 4. Cho m(g) sắt tác dụng hoàn toàn với dd HCl 20%, sau phản ứng thu
được 3,36 lít khí hidro đktc. Tính
a) m ?
b) khối lượng dd HCl đã tham gia phản ứng