It's ten years since the scientist _______on his life's work of discovering the valuable chemical.
| A．made for | B．set out | C．took off | D．turned up |
Mr. Bush is on time for everything. How _____ it be that he was late for the opening ceremony?
| A．can | B．should | C．may | D．must |
--What do you think of it?--I think it is a thing of importance that it ____ done soon.
| A．is | B．is to be | C．be | D．to be |
She is too slow. She ________ pass the test, but she __________ too little.
| A．would; knew | B．will; knows | C．would; knows | D．will; knew |
He _______ Shanghai, for I saw him talking with the headmaster a moment ago.
| A．must have gone to | B．can’t have gone to |
C．mustn’t have been to | D．can’t have been to |
—Why didn’t you attend the lecture yesterday?—I didn’t think that we _______ on Sundays.
| A．should | B．ought to have | C．shouldn’t have | D．will have to |