Tính chu vi hình tứ giác có độ dài các cạnh là: a) 3dm, 4 dm, 5dm và 6 dm. b) 10 cm, 15 cm, 10cm và 15cm.

1. A. tradition (the "a" sound is pronounced differently from the "i" sound in the other words)2. D. like (the "i" sound is pronounced differently from the"ai" sound in the other words)3. A. Christmas (the "ch" sound is pronounced differently fromthe "sc" sound in the other words)4. C. time (the "i" sound is pronounced differently from the"ai" sound in the other words)5. B. dish (the "i" sound is pronounced differently from the"e" sound in the other words)6. D. bonfire (the "o" sound is pronounced differently from the"a" sound in the other words)7. C. greeting (the "ea" sound is pronounced differently fromthe "i" sound in the other words)