he was very tired，he continued working in his office．（ ）
A．BecauseB．SinceC．Although
Mr． Black， you are becoming healthier and healthier． Please keep on_____．（ ）
| A． |
ran |
B． |
to run |
C． |
runs |
D． |
running |
The blue coat_____be Tony's． He never wears blue clothes．（ ）
| A． |
can |
B． |
must |
C． |
can't |
D． |
mustn't |
_____Aron has lost his right arm， he never gives up his dream to climb mountains．（ ）
| A． |
Since |
B． |
Although |
C． |
Unless |
D． |
If |
The accident took place_____ a cold November evening．（ ）
| A． |
on |
B． |
in |
C． |
at |
D． |
for |
What_____useful book it is!
Yeah， it tells you how to play the guitar．（ ）
| A． |
an |
B． |
a |
C． |
the |
D． |
/ |