The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ________ out to sea.
| A．to be staring | B．stared |
| C．having stared | D．staring |
______the room, a letter was seen lying on the desk.
| A．Entering | B．Entered | C．After entering | D．When he entered |
Only after you finish your homework ______TV.
| A．you are allowed to watch | B．are you allowed to watch |
| C．are you allowed watching | D．can you be able to watch |
--- Why were you so late for work today？
--- ________ to the office was very slow this morning because of the traffic.
| A． Driving | B．I drove | C．To drive | D．That I drove |
It was impolite of him ____without ____good－bye
| A．to leave; saying | B． leaving; to say | C． to leave; to say | D．leaving; saying |
Development of science and technology must benefit people ______ harm them.
| A．rather than | B．other than | C．more than | D．better than |