My boss is waiting for the report， so I can't leave here _______I finish it．（ ）
| A． |
since |
B． |
until |
C． |
though |
D． |
if |
Love your parents __________ they are alive． Don't wait until it is too late．（ ）
A．whileB．thoughC．becauseD．unless
The flying squirrel might be one of __________ animals you could meet during the trip．（ ）
A．strangeB．stranger
C．strangestD．the strangest
Some people don't show their talents at the very beginning．
I agree． Even Einstein ____________ read until he was seven．（ ）
A．can'tB．mustn'tC．couldn'tD．needn't
Keep quiet! I need complete__________ when I'm working．
Sorry， dad． I won't make any noise again．（ ）
A．trustB．silenceC．controlD．strength
Please stay with me this weekend．
I'm sorry， but my father and I planned _________ Beijing a long time ago．（ ）
A．visitB．visitingC．to visitD．visited