I have no idea ________ it is that makes him puzzled．

A．how

B．what

C．why

D．which

He sat at the desk, ________ a novel．

A．read

B．to read

C．reading

D．reads

________ tourism developing, more and more people prefer to go travelling for a holiday．

A．As．

B．With

C．Upon

D．For

Traditional folk arts of Tianjin, for example, paper cutting ________ at the culture show of the 2010 Shanghai World Expo, are attracting people all over the world．

A．to be exhibited

B．being exhibited

C．are being exhibited

D．have been exhibited

________ of the danger of walking in the street alone at night, the girl had to go home with a friend ________ her．

A．Warned; followed

B．Warning; following

C．Having warned; following

D．Having been warned; following

Those who act against the benefit of the people are ________ to fail．

A．scared

B．bound

C．dying

D．likely

The man pulled out a gold watch, ________ the hands were made of small diamonds．

A．of which

B．of whom

C．whose

D．of them

The clever boy made a hole in the wall, ________ he could see ________ was going on inside the house．

A．which; what

B．through which; what

C．through that; what

D．what; that

The thief went into the house at midnight, only ________ by the policemen hiding there．

A．to catch

B．catching

C．to be caught

D．caught

In spite of the great difficulties, Helen Keller ________ studying and finally succeeded．

A．stuck to

B．kept up with

C．kept on

D．insisted on