It is impossible for anyone ________ these photographs before, because Mr．Newman had them developed today．

A．having seen

B．to have seen

C．to see

D．seeing

The mother asked her daughter not to delay ________ the paper．

A．handing in

B．to hand in

C．hand in

D．having handed in

Generally speaking, ________ according to the directions, the drug has no side effect．

A．when taking

B．when taken

C．when to take

D．when to be taken

The discovery of new evidence led to ________．

A．the thief having caught

B．catch the thief

C．the thief being caught

D．the thief to be caught

________ time, he’ll make a first-class tennis player．

A．Having given

B．To give

C．Giving

D．Given

Mr．Smith, ________ of the ________ speech, started to read a novel．

A．tired, boring

B．tiring, bored

C．tired, bored

D．tiring, boring

The man we followed suddenly stopped and looked as if ________ whether he was going in the right direction．

A．seeing

B．having seen

C．to have seen

D．to see

The manager, ________ his factory’s products were poor in quality, decided to give his workers further training．

A．knowing

B．known

C．to know

D．being know

There are five pairs ________, but I’m at a loss which to buy．

A．to be chosen

B．to choose from

C．to choose

D．for choosing

Prices of daily goods ________ through a computer can be lower than store prices．

A．are bought

B．bought

C．been bought

D．buying