13 there are over 30 million books in this library
14 what does your mother do?
15 lan's sister is not as intelligent as lan
16 American students have more vacations than Vietnamese
17How much do these rackets cost?
18 why do not we eat out tonight
19 It is four -thirty five
20 my brother is better at math than me
21 their father took a taxi to london last month
22 when is your birthday?
23 robert can not better at cook than jane
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