We all know that we ________ our carbon footprint, but I suspect that many people wouldn't be prepared to go as far as Joan Pick, a retired scientist living in south London.
| A．must have reduced | B．should have reduced |
| C．may have reduced | D．could have reduced |
__________ the correct way of learning, and you must make much progress.
| A．Insist on | B．Insisting on |
| C．To insist on | D．Insisted on |
__________ Einsteins could not pay for __________ advanced education hat young Albert needed.
| A．The; the | B．A; a | C．An; the | D．The; an |
He insisted that all the work __________ within a week.
| A．must be finished | B．be finished |
| C．should finish | D．would be finished |
I always take something to read when I go to the doctor's __________ I have to wait.
| A．in case | B．so that | C．in order | D．as if |
—Do you mind me smoking here? —No, __________.
| A．a bit | B．not a bit | C．a little | D．not a little |