I lived at a time ________ there was no TV, radio or cinema．

A．where

B．which

C．when

D．that

－May I smoke here?

－If you ________ , choose a seat in the smoking section．

A．must

B．should

C．may

D．can

Going on a trip into ________ space must be quite ________ exciting experience．

A．/;the

B．the; the

C．the; an

D．/;an

Learning experience happens to us ________ our lives．

A．on

B．in

C．across

D．throughout

Australia suffered its worst-ever outbreak of wildfires in February, ________ more than 170 people were killed．

A．of which

B．on which

C．in which

D．from which

While we were listening to the speech attentively, a voice ________ to announce the result of the election．

A．broke in

B．broke up

C．broke off

D．broke down

In the green mountains ________ many rivers, breeding the people and living beings there．

A．stand

B．locate

C．run

D．have

October 1, 1949 is a special day, ________ I think, that will be remembered by all the Chinese forever．

A．which

B．what

C．it

D．one

He ________ on the farm for twenty years and now he is a teacher．

A．has worked

B．had worked

C．worked

D．works

Let us suppose that you are in ________ position of ________ parent．Would you allow your child to do such a thing?

A．a; a

B．a; the

C．the; a

D．the; the