The doctor looks tired and sleepy ________ he stayed up late to look after his patients yesterday．（ ）
| A． |
because |
B． |
if |
C． |
unless |
China plans to send another spaceship into space．
Wow! More and more secrets______soon．（ ）
| A． |
are going to discover |
| B． |
will be discovered |
| C． |
have discovered |
Mrs Green refuses______sweet food． She doesn't want to get fat．（ ）
| A． |
eat |
B． |
eating |
C． |
to eat |
Shanghai has a______population than that in many other cities．（ ）
| A． |
large |
B． |
larger |
C． |
largest |
Would you please______your e﹣mail address？ I missed it just now．
No problem．It's fox@163 ． com．（ ）
| A． |
repeat |
B． |
review |
C． |
record |
David fell fast asleep while he______a newspaper．（ ）
| A． |
reads |
| B． |
has read |
| C． |
was reading |