Giúp em với Càng nhanh càng tốt Cảm ơn rất nhiều

Cho tam giác ABC vuông tại A ,đường cao AH.Biết AB=15cm,AC=20cm.Tính AH,BH,CH

Calli:Gấu NL:Ai thích Hero Team khum ọ? ỌvỌ

21.Why don’t we ________ to the dance competition? A. go B. going C. to going D. to go 22.What time does it ________? A. opens B. starting C. closes D. start 23.The art exhibition ________ at 9 a.m. A. start B. finishes C. closes D. open 24.What time ________ the quiz show start? A. is B. am C. do D. does 25.The pottery class ________ at 8 p.m. A. opens B. finishes C. close D. start 26.The dance competition is ________ Sunday. A. in B. on C. at D. up 27.I’m sorry, I can’t because my class doesn’t finish ________ 4 p.m. A. in B. on C. to D. until 28.Would you like ________ to dance class? A. going B. go C. to go D. goes 29.When ________ it? A. do B. is C. does D. are 30.Why don’t we go to the carnival ________ the morning? A. in B. on C. at D. until II. Wordform: 1. I enjoy going ______________ (jog) 2. She wants to try rock ______________ in the mountain. (climb) 3. My mother enjoys ______________ in the morning. (cook) 4. My favorite activity is scuba ______________. (dive) 5. Soccer is one of ______________ activities around the world. (popularity) 6. She is an effective ______________. (act) 7. There are a lot of ______________ in my free time. (act) 8. My brother is an ______________ student in the school. (act) 9. Why don’t we go to the dance ______________ .(competitive) 10.Rock climbing is one of ______________ sports. (extremely) 11.I have to join in pottery ______________. (exhibit) 12.I enjoy walking a ______________ show on TV. (fashion) 13.These clothes look modern and ______________. (fashion) 14.I think art club sounds ______________. (interest) 15.They will find out some ______________ in the book. (inform) 16.Let’s meet in front of the ______________ park at 7 a.m. (amuse) 17.She sent to me her birthday’s ______________ card. (invite) 18.He helps his mom ______________ all old clothes. (collection) 19.She has a stamp ______________. (collect) 20.She works at a ______________ local market. (near) 21.Let’s go to the art ______________ in the city center this weekend. (exhibit) 22.We can buy Tuoi tre newspaper every day. Because it is a _____________ newspaper. (day) 23.My uncle has lot of watches. He has a watch ______________. (collect) 24. ______________ it rained hard, so the soccer match had to stop. (luck) 25.I suggest going mountain ______________ this vacation. (bike) 26.My father ______________ the colorful fish in the tank every day. (food) 27.That man is a stamp ______________. He has a lot of old and new stamps. (collect) 28.There are ______________ flights from HCM city to Ha Noi. (day) 29.It was ______________ believed that every strange old woman is a witch. (popular) 30.What’s your favorite ______________? (act)

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Giúp mình với ạ Trình bày đặc điểm khí hậu của châu phi để giải thích vì sao châu phi được gọi là châu lục nóng nhất thế giới

Điền từ 1: It's no use........to be interested in the book

4. Tính thể tích ở (đktc) của: a) 0,5 mol khí O2 b) 0,2 mol khí CO2 c) 16 gam khí O2 d) 32 gam khí SO2 e) 5 mol khí hiđro f) 12 gam khí SO3 g) 0,0015 mol khí H2S 5. Em hãy tìm khối lượng của: a) 1 mol nguyên tử Cl và 1 mol phân tử Cl2 b) 1 mol nguyên tử Cu và 1 mol phân tử CuO c) 1 mol nguyên tử C, 1 mol phân tử CO, 1 mol phân tử CO2 d) 1 mol phân tử NaCl, 1 mol phân tử C12H22O11 (đường)

Calli câu dưới Nl: tâm trạng mình bây giờ nó thế đấy,

1. Tính số nguyên tử hoặc phân tử trong những lượng chất sau: a) 0,1 mol phân tử O2 b) 0,5 mol nguyên tử Zn c) 2 mol nguyên tử H d) 1,5 mol phân tử CO2 e) 0,25 mol phân tử SO2 f) 0,05 mol nguyên tử S 2. Tính số mol của: a) 11,2 gam sắt b) 11 gam khí CO2 c) 32 gam oxi d) 9,6 gam magie e) 18,25 gam HCl f) 80 gam NaOH g) 49 gam H3PO4 h) 120 gam CuSO4 3. Tính khối lượng của: a) 0,05 mol nguyên tử sắt b) 1,5 mol phân tử hiđro c) 0,5 mol H2SO4 d) 0,2 mol Cu(OH)2 e) 0,115 mol Ca(HCO3)2 f) 0,075 mol KMnO4