Vai trò , ý ngĩa của việc bảo  quản thực phẩm ?

tổng sau là số nguyên tố hay hợp số?Giải thích?

3^2010.7.11+4^110.121.5

4. There isn’t a bookshelf in my bedroom.= I don’t …………………………..

5.Doing morning exercise every morning is good for you.=You …………………………….

6. It is wrong of us to write on the walls or tables in our classroom.=We ……………

7. A city is noisier than a village.=A village is …………………………………

48. The children look very…………….. while playing games during break time.

A. excite                           B. excited                     C. exciting                      D. excitement

49.Their house is small. They really want to have a ___________ house.

A.smaller                        B.bigger                          C.nicer                  D.cheaper

50There is ___________ sugar in the jar. Go and buy a kilo, Nguyet.”

A.some                           B.much                         C.little          D.few