By the time he was ten, Edison _________ experiments in chemistry.
| A．had already done | B．already had done |
| C．was already doing | D．already did |
I want to be _______police artist．It's_______interesting job．（ ）
| A． |
a； the |
B． |
a； an |
C． |
an； the |
D． |
the； the |
﹣﹣﹣Do you know ？
﹣﹣﹣Since last years．（ ）
| A． |
how long has he lived here |
B． |
how long he lived here |
| C． |
how long did he live here |
D． |
how long he has lived here |
Tony， never that again!（ ）
| A． |
does |
B． |
do |
C． |
did |
D． |
doing |
The team leader asked him to go and care of the old couple．（ ）
A
| A． |
．take |
B． |
taken |
C． |
taking |
D． |
takes |
A letter to you by the boss in one or two weeks．（ ）
| A． |
is sent |
B． |
will send |
C． |
sends |
D． |
will be sent |