We can never forget the days _______the two astronauts in spaceship worked together and the days _______we spent together.
| A．which; when | B．when; which | C．what; that | D．on which; when |
—I phoned you at 7 yesterday evening but nobody answered.
— Oh, I ______ my dog in the park then.
| A．walked | B．was walking | C．had walked | D．would walk |
So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.
| A．many of which | B．many of whom | C．many of them | D．many of that |
The fog was so heavy this morning that drivers could hardly ______ the
things just ten meters away from them.
| A．figure out | B．look out | C．make out | D．rule out |
I ______ a flu when I was on a spring outing with my classmates.
| A．caught up | B．picked up | C．took up | D．brought up |
The weather that day may not be as good as expected, in ________ case we will have to put off the event.
| A．what | B．that | C．this | D．which |