He made a mistake, but then he corrected the situation _______ it got worse.
| A．until | B．when |
| C．before | D．as |
—I am sorry for being late. I should have telephoned earlier.
. I have just arrived.
| A．That is to trouble |
| B．You are welcome |
| C．That is all right |
| D．You can never tell |
We live in an age____more information is available with greater ease than ever before.
| A．why |
| B．when |
| C．to whom |
| D．on which |
The workers ______ the glasses and marked on each box "This Side Up".
| A．carried |
| B．delivered |
| C．pressed |
| D．packed |
The weather turned out to be fine yesterday. I the trouble to carry my umbrella with me.
| A．should have taken |
| B．could have taken |
| C．needn’t have taken |
| D．mustn’t have taken |
Some aspects of a pilot’s job ___ be boring, and pilots often ___work at inconvenient hours.
| A．can; have to |
| B．may; can |
| C．have to; may |
| D．ought to; must |