71. I like looking at these pictures, but I ........enough by lunch-time. A. should have B. will have C. will have had D. have 72. John .........tennis once or twice a week. A. usually play B. is usually playing C. usually plays D. have usually played 73. I........for Christine. Do you know where she is? A. look B. looked C. am looking D. looks 74. At 5 o’clock yesterday evening, I ........my clothes. A. am ironing B. have ironed C. ironed D. was ironing 75. I ..........along the street when I suddenly heard footsteps behind me. A. was walking B. am walking C. walk D. walked 76. She ..........German for two years. A. has learned B. is learning C. learns D. learn 77. The earth ..........round the sun. A. go B. has gone C. went D. goes 78. Mathematics ...........very interesting to me. A. are B. have been C. were D. is 79. After he .............the house, he wrote a letter. A. cleans B. had cleaned C. has cleaned D. was cleaning 80. There are no more appeals. We .........them all. A. had eaten B. eat C. ate D. have eaten 81. Mark was listening to music while his sister ............a book. A. read B. reads C. is reading D. was reading 82. They..........serving meals by the time we get to the restaurant. A. will stop B. stopped C. are stopping D. will have stopped 83. Tomorrow I...........my grandparents. A. am going to visit B. will have visited C. have visited D. visit 84.Ted and Amy ...........for 24 years. A. married B. have been married C. were married D. has been married 85. I think the weather .............better later. A. will be B. be C. is D. has been 86. I was sad when I sold my car. I ..........it for a long time. A. am running B. were running C. had been running D. have been running 87. .............a car when they were living in London? A. Have they B. Did they have C. Were they having D. Have they had 88. She ..............angry when she knows this. A. shall be B. has been C. will have been D. will be 89. When their first child was born, they ..........married for three years. A. have been married B. had been married C. will be married D. will have been married 90. Sorry, I can’t stop now. I ......... to an important appointment. A. go B. am going C. have gone D. was going

Tổng của 4 số là 798. số bé nhất là Tổng của 5 số lẻ là 1795. số lớn nhất là

C/m đẳng thức: a^3+b^3= 9a+b) [(a-b)^2+ab]

Giải hộ mik ý b với ý c ạ, hứa sẽ vote 5 🌟 ạ và cảm ơn

Giúp mình bài này nha: (x - 1) (x + 1) (x + 2)

Cho 2 đa thức f(x) = (m-2) x^2 + x +1 a) Tìm m để đa thức f(x) có bậc là 1 b) Tìm m để đa thức f(x) nhận x=2 là nghiệm.

VI. Give the right forms of the verbs in brackets: Simple future or Simple present or Future continuos. 1. When you (go)…………… into the office, Mr John (sit) ……………………at the front desk. 2. Our English teacher (explain) …………………that lesson to us tomorrow. 3. We (wait) ………………..for you when you (get)………………. back tomorrow. 4. What you (do)…………….. at 7 p.m next Sunday? I (practice)……………….… my English lesson then. 5. When I (see) …………………..Mr. Pike tomorrow, I (remind) ………………….him of that. 6. When you (come) ………………..today, I (work) ………………at my desk in Romm 12. 7. He (work) ……………………on the report at this time tomorrow. 8. Please wait here until the manager (return)……………………... 9. Don't leave until you (see)…………………….. her. 10. The brown (do) ……………….their housework when you (come)………… next Sunday.

11. Viết các phương trình phản ứng điều chế trực tiếp FeCl2 từ Fe, từ FeSO4, từ FeCl3

V. Give the right forms of the verbs in brackets: Simple future or Simple present, Present perfect or Future perfect. 1. I'll wait until he (finish)……………… his novel. 2. When you (came) ………………….back, he already (buy)……………….. a new house. 3. Don't come until I (finish)……………… lunch. 4. I (hope) it (stop)……………….. raining by 5 o'clock this afternoon. 5. The river (not begin) ……………to swell until some rain (fall)……………….. 6. By next month I (leave)………………… for India. 7. The film (end)…………………. by the time we (get) ………………..there. 8. They (build) ……………..a house by June next year. 9. We (start)…………………. our plan next week. 10. I (give) …………………her your letter when I (see) ………………..her tomorrow.

Bài 4 thôi ah cần gấp trong 5p => đề: cho MN/PQ = 4/7 bt MN= 8cm. PQ =?