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1.How many mathematical problems have you done right?
2.He has done all the mathematical problems right.
3.He has done 7 mathematical problems including 5 right and 2 wrong.
4.Jack has taken my umbrella instead of his own by mistake.
5.Did she eat nothing all the day?
6.How many days did she eat nothing?
7.I booked rooms via the Internet while all the rooms have been booked out.
8.If you have no doubt ,please sign here.
9.We still have a vacant room .If you wanna lodge,please go and handle procedures as soon as possible.
10.How long does it take by bus/ taxi from the train station to this place?
11.It will take about 10 minutes by bus/taxi from the train station to this place.