They are stamp collectors；they often ________stamps with each other.
| A．change |
| B．train |
| C．treat |
| D．trade |
At last we found the hole in the wall _______ the mouse got into the house last night.
| A．in which | B．which | C．through which | D．by which |
There are three girls in the room, ________ is Tom's sister.
| A．the tallest of which | B．the tallest of whom |
| C．tallest of that | D．tallest of which |
I'll never forget the day _______ I bought my own guitar with my own money.
| A．where | B．on which | C．on when | D．that |
She is just the girl, with _______ my brother came to visit me last month.
| A．whom | B．her | C．that | D．who |
Last night we saw two movies, _______ was interesting.
| A．both of which | B．neither of which |
| C．both of them | D．neither of them |