* Fill in the blank with a suitable word:

Dealing (1)___ pressure and in middle school can (2)___ dificult. The pressure may be to take friends, earn good (3) ___, excel in sports or other activities , and deal with hectic schedules.

More and more people are going to high school now and it is becoming tougher to get it. Middle-school students face (4)___ to keep their gradesup every day. They are in a(5)___ with their peers to be the best and the brightest in everything.

During the teenage years, children will(6)___ the pressure to grow up. No longer will they be able to act (7)___ a child and not worry about responsibilities. Their (8)___ should help them make this transition from a child to an adult easy and teach them to (9)___ wise decisions. Prepare them for the world ahead of them and don't let go completely at (10)___.Gradually let the growing up occur.

1.many people limit their to the sun because their skin burns very easily.(expose)

2.the price of the book is 10 dollar in cluding and packing (post)

3.how are you getting on with your course in french.(correspond)

4.it is for beginning students to makes mistakes in english (avoid)

Khử hoàn toàn 10,23g hỗn hợp CuO, PbO bằng khí CO ở nhệt độ cao. Toàn bộ lượng khí CO2 sinh ra được dẫn qua dung dịch Ca(OH)2 dư. Phản ứng xong thu được 11g kết tủa.

a,Viết các PTHH.

b. Tính thể tích CO ở đktc tham gia phản ứng.

c. Tính thành phần % theo khối lượng muối oxit trong hỗn hợp ban đầu.

Hòa tan hoàn toàn 12,1 hai oxit CuO và ZnO trong 100ml dd HCl 3M.

a.Viết phương trình hóa học.

b.Tính thành phần % theo khối lượng của mỗi oxit trong hỗn hợp ban đầu.

c,Hãy tính khối lượng dd H2SO4 nồng độ 20% để hòa tan hoàn toàn hỗn hợp các oxit trên.