it/ help / save / environment

how have to do (first ,collect/ then ,find another to replace / finally ,arrange )

she / feel /happy / when/ look at / beautiful flower vases /make / them

Tìm x,y thuộc Z

\(\dfrac{x}{4}-\dfrac{1}{y}=\dfrac{3}{4}\)

Cho góc xoy =70 độ .Lấy B thuộc Ox , C thuộc Oy . Từ B kẻ đường thẳng song song với Oy ,Từ C kẻ đường thẳng song song với Ox chúng cắt nhau tại A . Tính 4 góc đỉnh A

IX. Change these sentences into passive voice

1.People speak English all over the world.
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2.The doctor examined the patients
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3.They are playing soccer in the school yard at the moment
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4.She can buy sugar at the grocer’s
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5.Tom is doing his exercises now
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6.Mr. Phong usually drinks coffee every morning
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7.Hoa put two apples on the table
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8.They will ask you some questions
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9.She won’t tell you her secret
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10.We haven’t seen him for a long time
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11.They have studied English since 2007
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12.No one knows him
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13.Some one cleaned our class
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14.Do the students enjoy the song ?
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15.Why do many people learn English ?
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16.What time do you cook dinner ?
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17.How did he do this exercise ?
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