Cho ΔABC, trực tâm H. Tìm trực tâm của các ΔHAB,ΔHAC Mn ơi giúp e với e sắp p nộp r ạ

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11. At this time last month, I (visit) ………………London 12. All last week, they (repaint)…………………. their school 13. When I (meet) ………….her, I (tell)……………… her about my family 14. While Mai (skip)………… rope, Tien (play)…………. marbles 15. Hoa and Nga (make)……………….. cakes between 3 and 5 yesterday afternoon 16. While I (repair)…………….. the roof, I (fall)…………….. off ladder 17. He (water)……………… the vegetable when I (come) …………………his house 18. While we (have) …………dinner, the telephone (ring)………….. 19. When I (see)……………. him, he (sit)……………. in the cofe 20. While she (slice) ……………. beef, she (cut) …………….her . From 4 to 6 yesterday afternoon, we (wait) ……………. for our teacher at the station

Alo cần gấp. Đúng câu 4 là hay nhất luôn

Ai giúp em bài này với , em cảm ơn

Chứng minh biểu thức sau luôn âm với mọi giá trị x

giúp em với ạ em sẽ cho ctlhn ạ

giúp mình vs mình cam ơn ạ mình đang cần gấp trong 20p đúng là đc hứa vote 5 sao vs ctlnh

HELPPPPPPPPPPPPPPPPPPPP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE Giaor thích cx đc

1.They (study)……………………. in the library when the fire alarm went off. 2. It (snow)……………………………. when I got up this morning. 3.Abert Einstein…………………………… ( show) his experiment when I came 4. Tom ( watch) ……………………TV while I (read)…………… books yesterday. 5. Hellen (wait) ……………………………for me at 7 pm yesterday 6. ……..he (work) …………………………..his way through college at this time? 7.He (teach)………………….. economics at Harvard when his dad arrived to live with him 8. The wind (blow)……………………….. very hard when I went out this morning. 9. He fell off while he (go)……………………… down the stairs. 10 . At this time last month, I (visit) ………………London