The commander said,“It is better ________ than sorry．”

A．to be safe

B．being safe

C．to be safer

D．being safer

－Can you tell me when you ________ the League?

－Last year．

A．joined in

B．took part in

C．joined

D．were a member

Neil Armstrong built wind tunnels to ________ the model aeroplanes．

A．test

B．clean

C．change

D．check

－Who's ________, do you know?

－He was a film star who introduced Kungfu to western countries．

A．Bruce Lee

B．Pele

C．Christopher Columbus

D．Elvis Presley

－Most of us have never ________ Paul Yum．Who is he?

－I don't know．It seems that Eddie knows much about him．

A．heard

B．heard about

C．heard of

D．heard from

－Why do you admire Armstrong so much?

－He's my hero because he is the first man ________ walked on the moon．

A．who

B．that

C．whom

D．which

You'd better keep the windows open every day ________ you can breathe fresh air．

A．so that

B．for

C．to

D．that

There are altogether four ________ in the world which covers over 70％ of the earth surface．

A．mountains

B．deserts

C．jungles

D．oceans

I ________ you a nice boat trip along the Thames River．

A．hope

B．wish

C．want

D．dream

In the Reed Flute Cave, you can see many wonderful rocks ________ different shapes．

A．in

B．with

C．of

D．for