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lehuuhiep2001
2 năm trước
Cho anken X phản ứng với Brom ( trong dung dịch ) theo tí lệ mol 1:1, thu được chất hữu cơ Y ( chứa 74,08% Br về khối lượng ). Xác định CTPT của X?
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Used to 1 - exercises Be used to / get used to 1. Used to / get / be used to 2. Used to / be / get used to 3. Would and used to 1 4. Used to - English exercises 5. Used to / to be used to 6. Would and used to 2 7. Will, would and used to 8. Used to / be used to / would 9. Used to / be used to / would 10. Used to / to get used to 11. To be used to + -ing 12. Past habits: used to 13. Use / used to / be-get used to Used to 2 - exercises Be used to / get used to 1. Affirmative - negative- questions 2. Used to / be / get used to 3. I used to vs I am used to 4. Used to / be used to / get used to 5. Used to or to be used to 6. Used to / get / be used to 7. Used to / be / get used to 8. Used to / be used to .. 9. Used to / would + infinitive 10. Used to - grammar practice 11. Used to or would - exercises 12. Used to - correct forms 13. Would and used to III. Fill in the PRESENT PERFECT SIMPLE forms of the verbs in brackets. 1.The bell ……… (JUST RING) 2.I ………..to him yet (NOT TALK) 3.I …………….to him several times (SPEAK) 4.He ………..here before (NOT BE) 5.They …………us for a long time. (NOT VISIT) 6.She ………..to England twice in her life (BE) 7.I ……………the dishes (ALREADY WASH). 8………….the radio yet ? (HE REPAIR) 9.She ………….the table. (JUST SET) 10.The teacher …………yet (NOT ARRIVE). 11. I ………….that book before. (READ) 12…………to Germany ? (YOU EVER BE) 13.I ……….him before (NEVER MEET). 14…………..him lately ? (YOU SEE) 15.He ……………..to me since last year (NOT WRITE). 16………………anything from your parents ? (YOU HEAR) 17.How long …………..that car ? (YOU HAVE) 18.Where ………………..(YOU BE)? 19.I …………………many new words this week. (LEARN) 20.He ……………..such a bright class before. (NEVER TEACH) IV.Complete the sentences with FOR or SINCE ! 1.John's parents have been living in Germany a long time. 2.The cat hasn't eaten anything yesterday. 3.Kim and Joey have been friends three years. 4.Miss Thomas has taught at my school 1975. 5.Guy has known Joanna they were at primary school. 6.Have you seen her she got married ? 7.I haven't heard from my pen pal a long time. 8.Halina has played the saxophone she was 12. 9.It has rained without interruption three days. 10.He's written to her every day she left. 11.You haven't emptied the rubbish bin last week. 12.She has kept the secret thirty years. 13.I've thought about you every day we met. 14.You've slept ten hours. 15.Have you spoken to each other you had the argument? 16.Hi ! I Haven't seen you ages. 17.How many times have you been late the beginning of the term? 18.We haven't played basketball they closed the gym for repairs. 19.I haven't had a cold years. 20.I haven't bought a new CD months.

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