Among the many dangers_________-- sailors have to face, probably the greatest of all is fog.
| A．which | B．what |
| C．where | D．when |
_________ we don't stop climate change, many animals and plants in the world will be gone.
| A． |
Although |
B． |
While |
C． |
If |
D． |
Until |
-Hi, I'm Peter. Are you new here? I haven't seen you around?
-Hello, Peter. I'm Bob. I just _________ on Monday.
| A． |
start |
B． |
have started |
C． |
started |
D． |
had started |
If we ___________the flight yesterday, we would be enjoying our holiday on the beach.
| A． |
had caught |
B． |
caught |
C． |
have caught |
D． |
would catch |
It was only when the car pulled up in front of our house ___________we saw Lily in the passenger seat.
| A． |
which |
B． |
that |
C． |
when |
D． |
where |
My washing machine ___________this week, so I have to wash my clothes by hand.
| A． |
was repaired |
B． |
is repaired |
C． |
is being repaired |
D． |
has been repaired |