1.The waiter refilled my glass
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2.My secretary will notify you next week
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3.Is a student pilot flying that airplane
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4.Alan 's knowledge about art doesn't impress me.
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5.People throw away billions of cans every year all over the world.
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12.The librarian didn't allow Tom to take those books home
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13.The teachers won't teach knowledge on recycling tomorrow.
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14.Hoi An attracts a lot of tourists
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15.Did all students attend first-aid course last year
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16.Farmer can milk cows twice a day.
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