a) The water wwas not warm enought for the children to swim in

-> The water was so ...

b) A note was written on the broard by Mai

=> Mai ...

2. a) A fairy appeared and ... changed her old clothers ( Magic )

b) Air .... is a big problem in the city ( pollute )

c) The child should be punished beacuse of his bad... ( behave )

3.giới từ a) You should learn the irregular verbs ... heart

b) The house is beautiful ... large garden

c)Many people go to big city to look .. work

d) It's very good... you to help me ... the housework

e) We 've been concerned ... the new mall ... ages

f) I haven't talked ... your brother

4. Your watch / expensive / his

b) You / finish / your homework / yet ?

a) Nam keeps forgetting his homework => Nam is ...

b) My mother gave me a very nice watch yesterday => I was ...

c) We'd prefer you not to moke => We'd rather ...

d) The water was so cold that the children couldn't swim in it => The water ...

e) To live on your salery must be hard => It...

f) It's interesting to read this book => this book...

g) A boy was injured in the accident , he is now in the hospital => The boy ...

Tìm các số nghuyên x, y thỏa mãn :

\(\left(x^2+y^2+1\right)^2-5x^2-4y^2-5=0\)

Tìm GTNN của \(A=3x^2+2y^2+2xy-10x-10y+2030\)

Tìm GTNN của

\(A=3x^2+2y^2+2xy-10x-10y+2030\)