_______is known to us is that time is limited and precious.
| A． It | B．That | C．What | D．As |
—I have a favour to ask of you.
—______.
| A．Go ahead | B．It’s a pleasure |
| C．Help yourself | D．Ask, please |
It’s reported that a bus went out of ____ control on a highway _____ east of the city and crashed into a river.
| A．the; the | B．不填; the | C．the; 不填 | D．不填; 不填 |
Medicine depends on other fields for basic information, particularly some of their specialized branches.
| A．conventionally | B．obviously | C．especially | D．inevitably |
Many fine cooks insist on ingredients of the highest quality.
| A．demand | B．rely on | C．prepare for | D．create |
I catch cold now and then.
| A．always | B．occasionally | C．constantly | D．regularly |