Bad habits, ______ formed(形成), are difficult to give up.
A．and B．once C．for D．but
These natural parks are very important for preserving many animals, which would ______ run the risk of becoming extinct(灭绝的)．
A．otherwise B．other than C．therefore D．in another way
The girl didn’t know who ______ for the broken vase.
A．will be blamed B．blamed C．was to blame D．blames
______ with the size of the whole earth, the highest mountain does not seem high at all.
A．When compared B．While comparing
C．Compare D．Comparing
—Does your uncle still smoke?
—He ____________given it up. It’s two years ever since he ____________.
A．can’t have; smoked B．may have; smoked
C．should have; has smoked D．should have; didn’t smoke
—Will you give me some suggestions on my job interview?
—Smiling is a great way to make yourself ____________.
A．stand out B．turn out C．work out D．pick out
