1. was watching - failed
2. will be
3. were preparing
4. were
5. will remember
6. received
7. were building - was - haven't finished
8. went
9. searched - lost
10. are you doing - am packing - will catch
11. have returned
12. arrive
13. will finish
14. see
15. will go - is raining - stop
16. forget
17. will be
18. has been
19. will be - get 
20. started

put the correct form of verb to complete sentences
1:Karen........is listening.....(listen) to music now.
2:The children............are playing..........(play) football at the moment.
3:We..........are having........(have) dinner now.
4:Are Mum and Dad..........working.........(work) at the moment.
5:We........are studying.........(study) for or test at the moment. 
6:What.......are.....you........doing......(do) right now?
7:The Smiths......are having........(have) dinner in the hotel restaurant at the moment.
8:Our mother........is cooking.....(cook) at the moment.

Prepositions

1. they have been pen lals.....for.....two years

2. ........In.........her first day.........to....... Ha Noi, Lan took her to the temple of literature

3. Maryam was impressed.......by........the beaty.........of..........the city

4. I used to walk past the mosque.........on..........my way..........to.......school

5. we should keep......in.......touch.........with........us.........for......more information

6. It seems difficult..........for........me to have a trip abroad

7. It is divided............into...........two ragions

8. I arrived.........to.......Ha Noi.............at...........5 o'clock last Sunday

don't know - is

a, \(35-815-\left(795-65\right)\)
\(=-780-730\)
\(=-1510\)

a, \(\left(43+863\right)-\left(137-57\right)\)
\(=906-80\)
\(=826\)

a, \(\left(27-514\right)-\left(486-73\right)\)
\(=-487-413\)
\(=-900\)

a, \(\left(3784+23\right)-3785-15\)
\(=3807-3785\)
\(=7\)

Quá khứ đơn hết vì đề cho vậy mà   "Put the verb into past form"

13.1. peaceful
13.2. peacefully
13.3. peacefully
13.4. peace
13.5. peace

14.1. atmosphere
14.2. atmosphere
14.3. atmospheric
14.4. atmosphere

1. went
2. didn't drive
3. arrived - were
4. asked - had
5. said
6. told
7. did you do - did
8. didn't watch
9. stopped - bought
10. was
11. didn't go
12. Did she get

46254:37=1250 dư 4

\(a\)\(,\) \(5^3.5^6=5^{3+6}=5^9\)
\(b,\) \(3^4.3=3^{4+1}=3^5\)