A = 671 x (100...0 - 3) + 2015                (Có 100 chữ số 0)

    = 67100...0 - 671 x 3 + 2015 

    = 67100...0 - 2013 + 2015 = 67100...0 + 2 = 67100..2

vậy tổng các chữ số của A là: 6 + 7 + 1 + 2 = 16  

Mr. Bao is(1).……sush………a teacher at a big school. He is young, tall and thin. He is not weak. He is(2)…strong………He(3)…does………morning exercises everyday. He lives(4)…in………a small house in Ha Noi. The school isn't near(5)……his……house, so he travels to wotk(6)…by………bus and he often(7)…leaves………his house at 7o'clock. He works from Monday to Friday. On Thursdays and Sundays, he(8)…has………free time.(9)……On…Sundays, he gets up at 8o'clock, then he sits in the kitchen to have(10)…breakfast………After that, he plays his favorite sports. He goes to bed at ten o'clock

1.A. sandwich B. children C. chocolate D. school 

2. A. season B. hospital   C. books   D.sister

3. A. go B. home C. bottle D. cold 

4.A. cook B. look C. food D. foot

5. A. eat B. read C. repeat D. breakfast

6. A. window B. down C. town D. shower

7. A. car B. garden C. park D. that

8. A. bus B. but C. up   D. busy

9. A. listen B. table C. market D. twice

10. A. tenth B. math C. brother D. theater

1. Can I ______ you?

a. help        b. to help        c. helping        d. helps
2. Look! The teacher ________ 
a. come        b. comes        c. coming        d. is coming
3. There is a lake to ______ of the house
a. right        b. the left        c. front        d. behind
4. I want ______ that movie
a. see            b. to see        c. seeing        d. sees
5. Her school is ______ than his school
a. small        b. smaller        c. smallest        d. the smallest
6. Ha Noi is the _______ of Viet Nam
a. capital        b. city            c. mountain        d. forest
7. _______ going to the museum?
a. Let’s        b. Why don’t        c. What about    d. Do you want
8. It’s a beautiful day today. Let’s ______ for a walk.
a. go            b. going        c. to go        d. goes
9. How _____ students are there in the yard?
a. many        b. much        c. often        d. O
10. How much is this ____ of cooking oil?
a. glass        b. box            c. bottle        d. bar