Investigators are still trying to determine the __________ of the accident.
| A．cause | B．problem | C．reason | D．puzzle |
—Would you like _______ , sir?
—No, thanks. I have had much.
| A．some more oranges | B．any more oranges | C．some more orange | D．any more orange |
Every minute is made full use of _______ our lessons.
| A．studying | B．to study | C．study | D．being studied |
Was it through Mary , ____ was working at a high school , _____ you get to know Tom ?
| A．who, who | B．that, which | C．who, that | D．who, which |
Mary couldn’t make herself _______ attention to because her classmates made so much noise.
| A．paid | B．to pay | C．pay | D．paying |
He arrived here at noon, in the day, and he went out and came back in the day.
| A．late; late | B．late; later |
| C．later; late | D．later; later |