It is duty to protect the environment.( )
we
us
ours
our
We can't decide to go for dinner because everyone wants to order something different.( )
A.howB.whyC.whenD.where
It sounds like a good plan, but you should it with your parents first.( )
A.keepB.learnC.discussD.choose
I didn't know anyone at the party, I felt a bit lonely.( )
A.orB.soC.andD.but
Thanks for helping , Mary. I have improved my English a lot.( )
A.meB.youC.himD.her
To our surprise, the computer won the chess game against the human player.( )
A.certainlyB.usuallyC.finallyD.mostly