*Activity 5: Change these sentences from the active into the passive.

Example: You must do this exercise carefully.
This exercise must be done carefully.
a) We can solve the problem.
……………………………………………………………
b) People should stop experiments on animals.
……………………………………………………………
c) We might find life on another planet.
……………………………………………………………
d) We have to improve all the schools in the city.
……………………………………………………………
e) They are going to build a new bridge in the area.
……………………………………………………………

*Activity 4: Change these sentences from the active into the passive.
Example: They sell jeans all over the world. 
=> Jeans are sold all over the world.
a) They made jeans cloth from cotton in the 18 th  century.
Jean cloth.................................................................. 
b) They grow rice in tropical countries.
Rice..................................................................
c) They will produce five milllion bottles of champagne in France next year.
Five million bottles of champagne...................................
d) They have just introduced a new style of jeans in the USA.
A new style of jeans..........................................
e) They have built two depar tment stores this year.
Two departments stores......................................

Mong mọi người giúp đỡ với ạ

Bài 4: Biết 4,48 lit khí CO2 (đktc) tác dụng vừa đủ với 200ml dung dịch
Ba(OH)2 sản phẩm sinh ra là BaCO3 và H2O.
a) Viết phương trình phản ứng.
b) Tính nồng độ mol của dung dịch Ba(OH)2 đã dùng.
c) Tính khối lượng chất kết tủa thu được.