— Why didn’t you try your best to get on the subway?
— I tried to, but it started moving ______ I could get on it.
| A．before | B．after | C．since | D．if |
Every day the old man takes these children home _____ school.
| A．at | B．to | C．from | D．after |
Could you come to my office ________ the day after tomorrow.
| A．/ | B．on | C．in | D．at |
We had built three bridges over the river _______ the end of 1994.
| A．at | B．on | C．for | D．by |
Life will be better _____ the 21st century.
| A．at | B．on | C．for | D．in |
Do you often work late _____ night?
| A．at | B．in | C．for | D．during |