—You may find the key to the math problem on page 107.
—Ah, it’s so simple. I wonder why I _____ of that.
| A．hadn’t thought | B．haven’t thought | C．didn’t think | D．wasn’t thinking |
．I don’t think it is going to rain the day after tomorrow, _______?
| A．do I | B．don’t I | C．is it | D．isn’t it |
I called ________ his house this morning, but he wasn’t in. So I left a message telling him I would call______ him the next day.
| A．on; on | B．at; at | C．at; on | D．on; at |
The man _______you played a trick is from Canada.
| A．to whom | B．at whom | C．on whom | D．whom |
—Are you coming to the Christmas party?
—I’m not sure. I_____ go to the concert instead.
| A．must | B．would | C．should | D．might |
Is it _________ Tom often plays computer games ________ makes you angry？
| A．that, that | B．Which, which | C．that, which | D．which, that |