The mountains form a natural between the two countries so they have no trade relations in history.
| A．exchange |
| B．bridge |
| C．barrier |
| D．fence |
I _______ my success to my family’s support.
| A．devote | B．contribute | C．refer | D．owe |
It is _________ pleasant to take a crowded bus.
| A．by no means | B．by means of | C．by all means | D．by any means |
It is uncertain _______ side effect the medicine will bring about,although about two thousand patients have taken it.
| A．that | B．what | C．how | D．whether |
Children who are not active or ______ diet is high in fat will gain weight quickly.
| A．what | B．whose | C．which | D．that |
People were perhaps more honest a long time ago when life was very different from _________ it is today.
| A．which | B．that | C．what | D．how |