I want to be ______ engineer when I grow up．（ ）
| A． |
a |
B． |
an |
C． |
the |
Shall we go to see the documentary Amazing China or stay at home？
Either is OK． ____．（ ）
| A． |
Go ahead |
| B． |
It's up to you |
| C． |
That's all right |
She stopped talking ____ her mother came into the room．（ ）
| A． |
as soon as |
B． |
unless |
C． |
though |
Mr． Green ____ be at home now． He went abroad on vacation last Friday．（ ）
| A． |
needn't |
B． |
mustn't |
C． |
can't |
Every morning he spends ____ hour doing exercise， then he goes to ____ work．（ ）
| A． |
an； \ |
B． |
a； a |
C． |
a； \ |
I can't find Jimmy． Where is he？
He ____ in the garden at the moment．（ ）
| A． |
works |
B． |
will work |
C． |
is working |