Anyone in the lab has to      the following dos and don’ts.
#10808
A
observe
B
consult
C
recognize
D
direct
推荐题目
________of the land in that area________covered with trees and grass.
#14084
A
Two fifth;is
B
Two fifth;are
C
Two fifths;is
D
Two fifths;are
I first met Lily five years ago. She ___ as a nurse in a hospital at the time. 
#11692
A
was working
B
has worked
C
had been working
D
had worked
________that the government can clear up official corruption,we are________about the future of our country.
#11962
A
Convinced;optimistic
B
Convincing;optimistic
C
Convinced;pessimistic
D
Convincing;pessimistic