Bài 1. Tìm số đối của mỗi số nguyên sau: -7; 0; -4; 12; |–5|;|5|| Bài 2. Tính: a) 8274 + 226 Bài 3. Tính: b) (- 5 ) + ( -11); c) (- 43) + (-9) a) 15 + ( - 5); Bài 4. Tính: a) 10- (- 5) ; c) 13 – 30; Bài 5. Tính tổng: a) (-30) + 15 + 10 + ( -15); b) 17 + ( -12) + 25 – 17; c) ( -17 ) + 250 +(- 13) + (- 250) ; d) ( -3) + ( - 14) + 27 + ( -10) Bài 6. Đơn giản biểu thức: a) (x + 17 )– (24 + 35); b) ( -32) – ( y + 20 ) + 20. Bài 7. Tính nhanh các tổng sau: a) ( 3567 – 214) – 3567; b) ( - 2017) – ( 28 – 2017); c) -( 269 – 357 ) + ( 269 – 357 ); d) ( 123 + 345) + (456 – 123) –

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• Complete the sentence with the correct form of the word in parentheses. 1. We had a four-day vacation in that coastal town. _____________________, it rained hard almost every day. (fortunate) 2. You can get all__________________ you need on the internet. (inform) 3. That region in the North of the country is very_____________________. (mountain) 4. “Does the price of the holiday include___________________?” I asked the tourist officer. (accommodate) 5. I was amazed by the___________________ of the scenery. (magnificent) 6. The hotel is located in the________________ district of the city. (center) 7. My hobbies ae traveling and _____________________. (photo) 8. He was ____________________ in having some good friend to help him. (fortune) 9. The new hotel can _________________ 600 guests at a time. (accommodation) 10. The table was placed____________________ with six nice chairs around. (center) 11. I think you are very__________________. You look very nice in these photos. (photo) 12. This dictionary is a little too expensive for me, but it is extremely______________. (inform) 13. There are ten______________ from Ha Noi to Ho Chi Minh City every day. (fly) 14. The _______________ institute in Nha Trang was built many years ago. (ocean) 15. His _________________ was quite unexpected. (depart) 16. Those people live in the _______________________ area. (mountain) 17. These regions have many ____________________ landscapes. (picture) 18. Stay with us until you can find your own ___________________. (accommodate) 19. My friend phoned to tell me the time of his _________________ in Ha Noi. (arrive) 20. Lan’s sister is a ___________________. She owns a flower shop in town. (flower)