It was about 600 years ago _______ the first clock with a face and an hour hand was made.
| A．that | B．until | C．before | D．when |
He _______ more visits to his parents.He has been regretting not doing so since they passed away.
| A．should pay |
| B．would pay |
| C．should have paid |
| D．would have paid |
Some aspects of a pilot’s job _______ be boring,and pilots often _______ work at inconvenient hours.
| A．can; have to | B．may; have to |
| C．have to; may | D．ought to; must |
English is a language that many people around the world _______ not speak perfectly but at least _______ understand.
| A．might；could | B．will；must |
| C．would；might | D．can；may |
Something is wrong with the window; it _______ not open.
| A．shall | B．may |
| C．will | D．can |
—Is there a basketball match between the LA Lakers and Houston Rockets this Saturday?
—There _______ be.I’ve already got one ticket.
| A．might | B．would |
| C．must | D．can |