Giải giúp mình câu a với d ạ mình cho 5* với hay nhất

50, I (not know)__________ when he (die) ___________. 51, Bill said he (forget)__________ to buy a dictionary 52, He felt asleep while he (do)__________ his homework 53, We (not see)__________ them for a long time 54, It (rain)__________ when we arrived 55, Kite and I (wait)___________ right here until you get back 56, He'll leave as soon as he (hear) _________ the news 57, Dick (start)_________ school before he (be)________ seven 58, How long you (study)__________ in this school? 59, We (not rêcive) ____________ any letter from him since he (leave)__________ four months ago 60, Where are you? I'm upstairs. I (have) _________ a bath

Viết một đoạn văn NGẮNNN: cảm nghĩ của em về tình yêu thiên nhiên và tinh thần lạc quan của Bác Hồ qua bài Ngắm Trăng. (7-10 câu nha!)

cho tam giác ABC vuông tại A. Đường tròn đường kính AB cắt BC tại D tiếp tuyến D cắt AC tại P CM P là td AC

Hộ mik vs: Viết PTHH xảy ra khi cho but-1-en tác dụng với dung dịch Br2(tạo sp chính), khí H2(Ni, t0) Phản ứng cộng HCl vào 2-metylpent-1-en cho sp chính là chất X. Viết PTHH xảy ra và gọi tên chất X.

31, Our teacher (tell) _________ us yesterday that he (visit)________ Singapore in 2010 32, Geogre (work)__________ at the university so far 33, When he lived in Manchester, he (work)________ in a bank 34, Birds (build)_________ their nests in summer and (fly)_________ to the South in winter 35, I (lose)_________ my key. (can)______ you help me look for it? 36, My father (not smoke) _________ for five years 37, My teacher wasn't at home when I (arrive)________________. He (just go) _____________ out 38, How long Bob and Mary (be) _________ married? 39, You (receive) _________ any letter from your parents yet? 40, My brother (join)____________ the army when he (be)__________ young.

Nêu phương pháp hoá học phân biệt 4 khí trong 4 lọ riêng biệt sau : O2,H2,CO2,N2

Xác định hàm số bậc nhất y=ax+b biết đồ thị của nó cắt trục tung tại điểm có tung độ bằng -2 và đi qua điểm M(2;3)

Mn giúp mk vs ạ mk đang cần gấp

41, You (remember)___________ my name or you (forget) __________ it someday? 42, Tom (study) ___________chemistry for three years and then he gave it up. 43, Miss Lee often (write) ____________ when he (be)__________ young 44, He (leave) __________ home two weeks ago and we (not hear)____________ from him since then 45, You (speak) __________ to Mrs.Bakers yesterday? No, I (not see) __________ her for a long time\ I (not can) ___________ remember when I last (see) __________ her 46, When the teacher came in, the pupils (play)__________ games 47, Columbus (discover)____________ America more than 400 years ago 48, By the next month, I (finish)_________ my first novel 49, By May 5, we (live) ________ in this city for ten years 50, When your father (die) ____________?