12. Up till now, Tim ( send ) ......................... Mary 3 letters.

13. It ( not/rain ) ........................ for a long time.

14.Emily ( paint ) ........................... her room three time up to the present.

15. Lisa and Colin ( just/go ) ....................... to a concert.

16. My friends ( smoke ) ....................... recently.

17. How long she ( live ) ................................ in this city.

18. We ( just / visit ) ............................... Ba Na Hill.

19. The students ( not/forget) ....................... their homework so far.

20. Ken and Fred ( not/decide) ....................... to go to the party yet.

1. She ( not / tidy ) ........................... up her room.

2. They ( use ) .................................. 3 laptop so far.

3. My father ( wash ) ........................... the car. It is very clean.

4. The children ( not read ) ....................... the comics yet.

5. Jason and Tony ( learn ) ................... Vietnamese for 4 years.

6. His mother ( not/make ) .................... breakfast so far.

7. I ( finish ) .......................... my homework yet.

8. My boss ( phone ) .............................. the helpline several times.

9.He already ( wash ) ............................ his favourite T - shirt himself.

10.Sarah ( not/have ) ..................... breakfast yet.

1.So far,he ( change ) ........................... his car three times.

2. Our teacher ( not arrive ) .............................. yet.

3. How long you ( work ) .................................. in this company?

4. you ( meet ) ............................. his family before?

5.Up till now , I ( save ) .................. 5.000$.

6.We ( learn ) ................................... to dance and sing recently.

7.How long your family ( live ) ...........................in London ?

Mn giúp e vs ạ.Mụt like và mụt theo dõi cho ng nhanh nhất ạ

27. Tom (write) a letter to his uncle yesterday.

28. My books (be)__________on the table.

29. He always (go) _____________to work by bike.

     30. My sister and I (not work) _____________on Sunday.

Mn giúp e vs ạ

a. ( 5^x+1 - 61) : 2² = 2⁴

^{b. ( x- 36 ) : 18 = 12}

a. 265 : 5 + 27 .2 - 3⁴ 

b. 3² .35 + 3² .65

c. 234 : [ 46 - 5.( 10 - 8 )² ]

d. 5² . 36 + 5² . 64

Mn giúp e Ex 2 vs ạ