Ừ chị quên mất :''<

Quên mất lịch thi :''<

 11/ He (fail)...failed.. ..the exam because he was lazy.

12/ They went to doctor because they (be)...were... sick.

13/ My father (play)...............played..............roller-skating when he (be).. ...was........ a child.

14/ I (not meet).....didn't meet........ Lan at the station yesterday.

15/Did You (go)........go... out with your friends last night?

16/ I (not finish) didn't finish.. homework.

17/ Did They (finish)......finish..... their work two hours ago ?

18/Many years ago, most people in Viet Nam (not have)...........didn't have.................. TV sets.

19/When did you (buy)...buy... ..this dress?- Two days ago

20/When did Thomas Edition (die)... ......die.............? - In 1931

21/She (use) ...used...to live a farm when she (be)...........was.......... a young girl.

22/ My mother (go)......went.........to the supermarket yesterday evening, but she (not buy)..didn't buy.anything

23/ I (study)..have studied..English for 7 years.

24/ Did You (meet)..meet..Tom on your last birthday?

25/They(think).thought..about me 2 days ago.

1/I(not be).wasn't...at home lasr month.

2/Marie Curie(receive)..received .the Nobel Price for the Chemistry in 1911.

3/Where were you(be)...yesterday?

4/They(perform)..performed.”Romeo and Juliet” last Sunday.

5/They went to the doctor because they(be).were..sick.

6/He(move).moved..to Paris in 1917 and (spend)..spent.six years in Paris.

7/Hoa(not be).wasn't..at the seaside yesterday.

8/It is about time we(do).done..something to stop accident.

9/ Was Nam(be)...at the party yesterday?

10/Why was he(be)...absent from school yesterday?

1. don't economise

2. will finish - get

3. won't be 

4. are they speaking

2. baking

3. go

4. watches

5. don't

6. isn't

\(\left(\sqrt{2}-1\right)^x.\left(\sqrt{2}+1\right)^x=1^x=1\) \(\Rightarrow\left(\sqrt{2}+1\right)^x=\dfrac{1}{\left(\sqrt{2}-1\right)^x}=\dfrac{1}{t}\)

Viet: \(log_3x_1+log_3x_2=m\) \(\Leftrightarrow log_3\left(x_1.x_2\right)=m\) \(\Leftrightarrow x_1.x_2=3^m\Leftrightarrow81=3^m\Rightarrow m=4\)

D.