It was playing computer games _____ cost the boy plenty of time _______ he ought to have spent doing his lessons.
| A．what; that | B．that; when |
| C．which; that | D．that; that |
____ 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 |
______ with the size of the whole earth, the biggest ocean does not seem big at all.
| A． Compare | B． When comparing | C． Comparing | D． Compared |
Varieties of household goods are sold here, ________from babies’ toys to old men’s walking sticks.
| A．changing | B．varying | C．ranging | D．classifying |