—Mike, why are you standing outdoors?
—I ______ my keys. I have to wait here until my mother comes back.
| A． |
have lost |
B． |
will lose |
C． |
had lost |
D． |
lose |
Our teacher often asks us______ time．（ ）
| A． |
not waste |
B． |
don't waste |
| C． |
not to waste |
D． |
doesn't waste |
I have been in China______ 1997．（ ）
| A． |
since |
B． |
for |
C． |
in |
D． |
until |
Be careful with the knife．You may hurt______．（ ）
| A． |
himself |
B． |
ourselves |
C． |
myself |
D． |
yourself |
Their classroom is as______ as ours．（ ）
| A． |
cleaner |
B． |
clean |
| C． |
the cleanest |
D． |
much cleaner |
Beijing is one of ______ biggest cities in China．（ ）
| A． |
a |
B． |
an |
C． |
the |
D． |
/ |