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 |
— Could you please explain the assignment for Monday, Miss Smith?
— Certainly. Read the next chapter and come to class ________ to discuss what you’ve read.
| A．preparing | B．prepared |
| C．to prepare | D．to be prepared |
Home is ________ somebody notices when you are no longer there.
| A．that | B．when | C．how | D．where |
— Mom! Jack has broken a cup!
— Doesn’t matter. Accidents ________ happen.
| A．should | B．must | C．will | D．Shall |
The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
| A．until | B．though | C．because | D．Unless |
There is no doubt that _________ a goal, one needs not only knowledge but also good personalities.
| A．achieve | B．achieving |
| C．to achieve | D．achieved |