Recently some studies have found that learning ____________ second language can lead to _______________ increase in one’s brain power.
| A．a; the | B．不填; the | C．a; an | D．the; an |
Is this the school ____ we visited three years ago?
| A．the one | B．where | C．in which | D．/ |
How many students are there in your class ____ homes are in the country?
| A．whose | B．who | C．whom | D．which |
Alice received an invitation from her boss, ____ came as a surprise.
| A．it | B．which | C．that | D．he |
The train was crowded and I had to get into a carriage ____ already seven other people.
| A．when there were | B．which there were |
| C．that there were | D．where there were |
I live in the house ____ windows face south.
| A．which | B．whose | C．where | D．in that |