Besides proper diet, exercise is one of the key ___________of a healthy lifestyle.
| A．components | B．categories | C．ranges | D．processes |
Tom ought not to ________ me your secret, but he meant no harm.
| A．have told | B．tell |
| C．be telling | D．having told |
We ________ last night, but we went to the concert instead.
| A．must have studied | B．might study |
| C．should have studied | D．would study |
—I’ll tell Mary about her new job tomorrow.
—You ________ her last week.
| A．ought to tell | B．would have told |
| C．must tell | D．should have told |
On Sundays there were a lot of children playing in the park, and _______ parents were seated together joking.
| A．their | B．whose |
| C．which | D．that |
American people are wondering whether the newly-elected president and his administration will keep the nation safe and defend it _______ any terrorist attack in the future.
| A．to | B．on | C．against | D．with |