In a way, Pompeii is like a time capsule ____ a frozen moment in history.
| A．protecting | B．preserving | C．preventing | D．protesting |
Nowadays, cellphones have features such as games ,music and calendars and more new functions___.
| A．are added | B．have added |
| C．are being added | D．have been added |
It is the interaction between people, rather than the events ___ occur in their lives, ____ is the main focus of social psychology.
| A．that; that | B．that; which |
| C．which; which | D．that; what |
—Will you join us in the party this Saturday evening?
—If I ____ ,I would ;but I will have left for Japan on business by then.
| A．am free | B．were to be free |
| C．will be free | D．would be free |
He didn’t put the things ______ they belonged, for ______ reason he got his punishment．
| A．which; that | B．what; this |
| C．that; whose | D．where; which |
How can you expect him to make any progress _____ you never give him a chance to have a try?
| A．when | B．unless |
| C．even though | D．until |