III. Choose the best answer:

1.     My father ______ for a car-making factory since 1995.(worked/ has worked/ have worked)

2.     The Robinson _______ in Ha Noi in 2000. (arrived / arrive / has arrived / will arrive)

3.     Nick _______ sick yesterday, so he didn’t go to school. (is / was / has been / will be)

4.     If I _______ enough money, I’ll buy a dictionary. (have / had / will have / would have)

5.     Don’t be noisy! I _______ my homework (am doing / was doing / do / did)

6.     This old man is often busy with______waste paper after school.(collecting/ collected/ collects/ to collect)

7.     My brother usually _______ to work early. (go/ goes / went / has gone)

8.     I _______ anything for two days, so I am very hungry now. (haven’t eaten/ didn’t eat/ don’t eat)

9.     She enjoys _______ cartoon in her free time. (watching / watches / watched / watch)

10.  My pen pal, Maryam _______ a letter to me since last year. (didn’t write / doesn’t write / hasn’t written)

11.  A: “I’m very tired” – B: “You should _______ inside. (stay/ staying /. stayed / be staying)

12.  _______ there is too much fog, the flight was cancelled. (Because / and / But / Although)

13.  Mai visited all the famous places in Ha Noi_______ she was tired. (although/ because/ but / or)

14.  We got wet _______ we forgot the umbrella at home. (so/ because / and / therefore)

15.           My friend Lan likes  ______ flowers  after school.( arranging / playing / doing / studying)

Giải phương trình sau:

\(\sqrt{x^2-4x-8}+\sqrt{x^2+2\left(1-\sqrt{3}\right)x+8}+\sqrt{x^2+2\left(1+\sqrt{3}\right)x+8}=6\sqrt{2}\).

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[Toán.C285-293 _ 6.3.2021]