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1、 He likes history because it's interesting.（对划线部分提问）
he history?
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2、 The classroom is tidy.（改为否定句）
The classroom .
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3、 This is my schoolbag.（改为复数句）
our .
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4、 We have a computer class on Friday.（改为一般疑问句）
a computer class on Friday?
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5、 The art room is on the second floor.（对划线部分提问）
the art room?
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6、 We often play games after class.（对划线部分提问）
you often after class?
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7、 There are some books in the library.（改为否定句）
There books in the library.
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8、 He goes to school by bike.（改为一般疑问句）
he to school by bike?
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9、 School is over at 4:30 p.m.（对划线部分提问）
school over?
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10、 My favorite subject is biology.（对划线部分提问）
your favorite subject?
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11、 We have English on Wednesday.（对划线部分提问）
you English?
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12、 Our school life is (colourful). We have many interesting activities.
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13、 The students often (answer) questions in class.
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14、 —Do you have (some) new books?
—Yes, I do.
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15、 There are many (classroom) in our school building.
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16、 My sister likes (water) the flowers in the garden.
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17、 We have a music class on (Tuesday). We sing songs together.
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18、 There are five (knife) on the table. Be careful with them.
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19、 Please (put) your schoolbag on the chair.
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20、 The library is on the third (floor). We can read books there.