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10:(0,2+0,9/x) =5 (0,9/x = 0,9 phần x)
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Ex4. Choose the correct answers A,B,C or D. 1. .............. you a student in Chu Van An School ? A. was B. to was C. were D. to be 2. I didn’t ...........here three years ago. A. came B. come C. to come D. coming 3. He ................ tomatoes before. But, he is eating it now. A. like B. likes C. liked D. didn’t like 4. I (not study)................... French when I was a child. A. not study B. didn’t study C. don’t study D. studied 5. I last..............her two months ago. A. see B. saw C. sees D. seeing 6. She ............. the gold medal in 1986. A. won B. win C. wins D. A,B correct 7. What .......you ...... last night ? A. do/do B. did/do C. was/do D. do/did 8. They ..................... football on TV all day. A. watches B. watch C. watching D. watched 9. It ..................................... heavily last July. A. rained B. raining C. rains D. was rain 10. They....................their country when they was ten. A. leave B. to leave C.left D. leaving

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