His office is on the top of the tall building． You should take a lift to the floor．（ ）
| A． |
first |
B． |
thirtieth |
C． |
thirty |
D． |
thirteen |
While Alan was writing a letter， the children outside（ ）
| A． |
play |
| B． |
were playing |
| C． |
will play |
Excuse me． I wonder the plane can land on time．
Wait a minute， please． Let me check it out．（ ）
| A． |
if |
| B． |
which |
| C． |
that |
The school music festival next Monday．（ ）
A．was heldB．held
C．will be held
I sleep with the window open it's really cold．（ ）
A．unlessB．tillC．or
It's a good idea to new words in the dictionary．（ ）
A．cut upB．look upC．put up