He is very humorous, while his brother is rather serious. That is ___their difference lies.
| A．why | B．where | C．how | D．when |
I got this bicycle for______：My friend gave it to me when she bought a new one．
| A．everything | B．something | C．anything | D．nothing |
As he reached _____front door, Jack saw ______strange sight．
| A．the;不填 | B．a; the | C．不填a | D．the; a |
I have bought two ball pens ,______ writes well.
| A．none of them | B．neither of them | C．neither of which | D．none of which |
——I let my secretary call you several times. Do you know that?
——I _____in a meeting. I’m sorry.
| A．had been | B．was | C．am | D．have been |
It was only when I reread his poem recently _____ to appreciate its beauty.
| A．that I began | B．did I begin | C．I began | D．until I began |