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các bạn giải giúp mình 2 câu này với,mình đang cần gấp và cho mình xin cách giải luôn ạ,mình xin cảm ơn. Bài 32:Một nhóm học sinh gồm 6 nam và 4 nữ.Chọn ngẫu nhiên 4 học sinh từ nhóm . a)Có bao nhiêu cách chọn? b)tính xác suất cả 4 học sinh được chọn là nữ.
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II. Tense 1. Last night at this time, they ................ the same thing. She.................and he............the newspaper A. are doing- is cooking- is reading B. were doing- was cooking- was reading C. was doing- has cooked- is reading D. had done- was cooking- read 2. Sam..............to change a light bulb when he................and......................... A. was trying-slipped- fell B. tried- was slipping- falling C. had been trying- slipped- was falling D. has tried- slips- falls 3. Every day I _________up at 6 o’clock, _______breakfast at seven o’clock and_______for work at 8 o’clock A. get- eat- leave B. have got- eating- leaving C. got- ate- left D. will get- have eaten- left 4. I ............ for this company for more then thirty years, and I intend to stay here until I ...........next year. A. am working- will retire B. am going to work- am retiring C. work- am going to retire D. have been working- retire 5. My mother is the first.................up and the last......................to bed A. getting- going B. to get- going C. getting- to go D. to get- to go

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