You can’t complain of being lonely _________ you don’t make any effort to meet people．

A．until

B．when

C．once

D．though

British scientists have produced _________ they believe is the world's smallest Christmas card．

A．which

B．who

C．that

D．what

All of us have the desire to visit the three main temples in Athens, especially _________ that contains a gold and ivory statue of Athena．

A．the one

B．one

C．the ones

D．those

Canada, _________ second to Russia in size, is _________ home of all kinds of animals and plants, making it famous for its natural scenery．

A．/; a

B．the, the

C．the, /

D．/; the

Nowadays people take _________ exercise a day as they did in the past because of widely used automobiles．

A．less than half

B．less than as half as

C．less than half as much

D．half less than

They were standing so far away that I couldn’t _________ their faces clearly．

A．make out

B．make for

C．make off

D．make up

The dining room is clean and tidy, with a table already _________ for a big meal．

A．being laid

B．laying

C．to lay

D．laid

_________ some teenagers don’t realize is _________ difficult life can be after they get addicted to drugs．

A．What; how

B．What; what

C．That; how

D．That; what

Among Asimov's most famous works of science fiction, one _________ he won an award, was the Foundation Trilogy．

A．of whom

B．of which

C．for whom

D．for which

Some retired people have nothing to do．They often get together and _________ for hours talking about their past experiences．

A．look around

B．get around

C．turn around

D．sit around