Last term our maths teacher set so difficult an examination problem _____ none of us worked out.
| A．that | B．as | C．so that | D．which |
—Do you know why the teacher asks for me?
—He wants you to ________ your absence last night.
| A．account for | B．call for |
| C．send for | D．reach for |
When the book，Twilight，was first ________，it was immediately well received by readers.
| A．brought up | B．brought down |
| C．brought about | D．brought out |
I didn't want to drive all the way to New York by myself，so I ________ Anna，my best friend of ten years，to ride with me.
| A．convinced | B．consulted | C．adopted | D．admitted |
Thousands of visitors were ________ to the Xi'an International Horticultural Exposition the day it opened.
| A．adopted | B．accepted | C．attracted | D．attached |
The farmers had the machine ________ all day and night.
| A．work | B．working |
| C．worked | D．to work |