1. If you have a problem, ask ………for…… help.

2. Can I speak ……with……… you for a minute?

3. My children are afraid ……of……… dogs.

4. This guide book is full ……of……… useful information.

5. I agree ………with…… you about most things, but not politics.

6. Don’t worry about the baby.

I’ll look ……after……… her while you’re out.

7. She fell ………off…… her horse and hurt her wrist.

8. Don’t forget to turn ……off……… the lights when you go to bed.

9. Put ………on…… your warm coat. It’s cold today.

10. Could I try ……on……… these shoes, please? Size nine.

If you keep eating fast food,____you might get fat_______________(might)

Do vai trò x, y, z trong phươg trình bình đẳng

Ta xét x≤y≤z

Vì x,y,z nguyên dương=>xyz≠0 mà x≤y≤z=>x+y+z≤3z

=>xy≤3

=>xy∈\(\left\{1,2,3\right\}\)

Xét x=1=>y=1

=>2+z=z(vô lí)

Xét xy=2, x≤y=>z=1;y=2

=>z=3

Xét xy=3, vì x≤y=>x=1;y=3=>z=2

Vậy nghiệm nguyên duoqng của phương trình trênlà hoán vị của (1,2,3)