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lequanghai742001
2 năm trước
1 đoạn ADN có chiều dài 4080 angstrong có A= 20% tổng số nu.hãy tính số nuclêotit mỗi loại của đoạn ADN
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II. Put the verbs in the brackets into the correct form. 1. I usually (get )………………….up early in the morning. 2. Last night , I (see) ……………..Tom but he (not, see) ………………………me because he (go) ………………………………with his friends. 3. (she, sing)………………………………………………very well? 4. I (live) …………………..here in 1970. 5. My teacher (teach) …………………………..English at this school for six years. 6. Listen! I think someone (knock) ……………………….at the door. 7. Mr Smith (pay)……………..the bill before he went out. 8. Michael (study)………………..English for six months . 9. You (not, speak)…………………a word since you (come)………………home. 10. It usually (rain)………………………very much in that part of the country. 12. He thanked me for what I (do)……………………………….. 13. He (be) ……………late because he (have)…………………….an accident last Saturday. 14. What (she/do)………………….when you (arrive)………………………..? 15. John (work)………………….hard when suddenly the door (open)……………….. 16. I (wait)…………..here for her since 7 o’clock and she (not come)…………… yet. 17. I have not met him since he ( leave)………………………..school. 18. It (take)………….. me 15 minutes to get to school every morning. 19. We (not have)…………. dinner at home on Saturdays. 20. When I was a child, I usually (go)…………. fishing with my brother.

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