—There is still a copy of the book in the library.Will you go and borrow ________？
—No，I’d rather buy ________ in the bookstore.
| A．it；one | B．one；one |
| C．one；it | D．it；it |
They want to make _______ clear to the public that they are doing an important and
necessary job.
| A．this | B．that | C．it | D．what |
_____ the child to bed, she began to correct the pupil’s exercise.
| A．Sending | B．Being sent | C．Sent | D．Having sent |
____ with a difficult situation, Arnold decided to ask his boss for advice.
| A．To face | B．Having faced | C．Faced | D．Facing |
It was ______ back home after the experiment.
| A． not until midnight did he go | B． until midnight that he didn’t go |
| C． not until midnight that he went | D． until midnight when he didn’t go |
It was 1969___ the American astronauts succeeded in landing on the moon.
| A． that | B． when | C． on which | D． which |