单项选择题

______, he always tries his best to solve it.

A．Though difficult the problem is
B．However difficult the problem is
C．Though difficult is the problem
D．However the problem is difficult
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单项选择题
In many countries, a person is said to have attained his ______ on the eighteenth birthday.
A．adult
B．age
C．grown-up
D．majority
单项选择题
If only I ______ the petrol before we started out. Now I have to push the car to the road side.
A．should check
B．have checked
C．had checked
D．checked
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