單項選擇題One cannot learn a foreign language well（）he studies hard.

A.unless  
B.if
C.as   
D.when


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1.單項選擇題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

2.單項選擇題On my left（）a wide river; on my right, a dark forest.

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

3.單項選擇題On formal（）, people pay more attention to manners.

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

4.單項選擇題On average, a successful lawyer has to talk to several（）a day.

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

5.單項選擇題On（）side of the street there are some trees.

A.both 
B.either  
C.every
D.all