– Is the math problem ______?
-- Yes, I can work it out ______.
| A．easy； easily | B．easy ； easy |
| C．easily ； easy | D．easily ； easily |
Mr. Bush is on time for everything. How _______ it be that he was late for the opening ceremony?
| A．should | B．can | C．may | D．must |
The houses of the rich are generally larger than _______ of the poor.
| A．those | B．ones | C．the one | D．that |
When the teacher came in, he saw some boys _______ behind Daniel, _______ the computer games.
| A．sit, watching | B．sitting, watching | C．sit, to watch | D．sitting, watched |
It _______ long ______ we know the result of the experiment.
| A．will not be, before | B．is, after | C．will not be, until | D．is, before |
--- Would you please give him the paper the moment he _______?
--- No problem.
| A．arrives | B．appeared | C．came | D．reaches |