单项选择题One needs a good sense of() to ride a bike.

A.level   
B.skill   
C.balance  
D.ability


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2.单项选择题One cannot learn a foreign language well()he studies hard.

A.unless  
B.if
C.as   
D.when

3.单项选择题One and a half hour()since we arrive. No one has come to meet us.

A.have passed
B.was passed
C.pass
D.has passed

4.单项选择题On my left()a wide river; on my right, a dark forest.

A.has been
B.was
C.are
D.would be

5.单项选择题On formal(), people pay more attention to manners.

A.situations
B.cases
C.conditions
D.occasions

6.单项选择题On average, a successful lawyer has to talk to several()a day.

A.customers
B.supporters
C.guests 
D.clients

7.单项选择题On()side of the street there are some trees.

A.both 
B.either  
C.every
D.all 

8.单项选择题Of all the students in our class, Betty writes()

A.very carefully 
B.most carefully 
C.more carefully
D.the most carefully

9.单项选择题Not until the meeting was over()that he had made a mistake in his speech.

A.he realized   
B.did he realize 
C.hehas realized   
D.has he realized

10.单项选择题Nobody believed him()what he said.

A.even though
B.in spite
C.no matter
D.contrary to