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1、 She got 90 percent in the math test.（对划线部分提问）
did she get in the math test?
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2、 This province has 21 cities.（改为同义句）
There are in this province.
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3、 The meeting will start at 9:30.（对划线部分提问）
will the meeting start?
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4、 He spent 150 yuan on the new book.（对划线部分提问）
did he spend on the new book?
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5、 The population of the city is about 2,000,000.（改为同义句）
The city has a population of about .
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6、 This is the 3rd time he has won the chess prize.（对划线部分提问）
time is this that he has won the chess prize?
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7、 There are 50 students in our class.（对划线部分提问）
students are there in your class?
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8、 The (system) of counting in this country is different from ours.
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9、 He chose to walk (instead of) taking the bus to save money.
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10、 I wonder if the temperature will (go down) tomorrow—it's too hot today.
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11、 The company's profits have started to (go up) after three months of falling.
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12、 We need to (write down) the important numbers in our notebooks.
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13、 The number system in ancient China (represented) numbers with special characters.
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14、 She (replied) to my question without hesitation: "I agree with you."
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15、 The (symbol) "%" represents per cent in mathematics.
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16、 Can you (count) the number of books on the shelf? There are too many to guess.
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17、 Currently, the population of this (province) is growing sharply.
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18、 He won a (silver) medal in the chess competition last month.
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19、 The price on the (price tag) is 199 yuan, but it's on sale for 150 yuan.
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20、 Over 50 (percent) of students in our class like math challenges.