It is known to all that a proper amount of exercise ________ to good health.
| A．benefits | B．contributes | C．values | D．improves |
Do swim with others. Otherwise, you _________.
| A．can get drowned | B．will get drowned |
| C．might have got drowned | D．might get drowned |
David was very unhappy for ____ to the party which was held in his cousin’s house.
| A．having not been invited | B．not having invited |
| C．not having been invited | D．having not invited |
Jim has ____ the time he spends surfing the Internet in order to study hard in this new term.
| A．cut down | B．broken down |
| C．cut up | D．broken up |
We must apply what we have learned to our daily work because in no case _____ from practice.
| A．should theory separate |
| B．should theory be separated |
| C．theory should separate |
| D．theory should be separated |
We can never expect _____ bluer sky unless we create _____ less polluted world.
| A．a, a | B．a, the | C．the, a | D．the, the |