. Just like a voyage at sea, our life journey, ______ time is limited, is full of difficulties as well as opportunities.
| A．what | B．of which | C．while | D．whose |
Many people agree that _________ knowledge of English is ________ must in international trade today.
| A．a; the | B．不填；不填 |
| C．a; 不填 | D．a; a |
----What was it that caused the party to be put off? ----______________ the invitation.
| A．Because Tom delayed sending | B．Tom delayed to send |
| C．That Tom delayed sending | D．Tom delaying sending |
When I opened the door, I found my father ________ in his chair, completely _______ in a magazine.
| A．seated; absorbing |
| B．seating; being absorbed |
| C．seating; absorbed |
| D．seated; absorbed |
Bob, who is senior to me _______ two years, treated me ______ a movie.
| A．by; to | B．for; to |
| C．by; with | D．to; with |
----All the building materials have been washed away.
----So I have heard. But there was no sign ____ a heavy rain was on the way last night.
| A．when | B．that | C．which | D．if |