Cho tam giác ABC đồng dạng tam giác DEF. Nếu A= 80 độ, B = 70 độ và DE = 2cm, DF= 3cm, AB = 4cm Tính AC???

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Đặt câu hỏi cho phần trong (.......) : 1.- (The children )swam in the lake. ……………………………………………………………………………………………………… 2.-( The glass) fell of the table. ……………………………………………………………………………………………………… 3.- They saw (lions and tigers )at the zoo. …………………………………………………………………………………………………….. 4.- He left the party( at 11.o’clock.) ……………………………………………………………………………………………………… 5.- John went (to the beach) last Sunday. …………………………………………………………………………………………………….. 6.- He gave her( a bunch of flowers) for her birthday. ……………………………………………………………………………………………………… 7.- The company sent the new worker( to California.) …………………………………………………………………………………………………….. 8.- My sister dreamt about( the monster) last night. ……………………………………………………………………………………………………… 9.- My grandmother heard a loud scream (last night.) …………………………………………………………………………………………………….. 10.- We went to the History Museum. …………………………………………………………………………………………………….. 11.- He fell ( because he slipped on a banana peel.) ……………………………………………………………………………………………………… 12- The teacher was angry( because he didn’t do his homework.) …………………………………………………………………………………………………….. 13.- It took( us about half an hour) to get to school. …………………………………………………………………………………………………….. 14.- She last rode a bike (two weeks ago.) …………………………………………………………………………………………………….. 15.- I bought (half a kilo) of cheese. …………………………………………………………………………………………………….. 16.- He (took his driving test) two days ago. ………………………………………………