—How did you find him out? —I ______ his name by chance on the list.
A．came down B．came about C．came up D．came across
If you ______ talk about it with me, please wait till I finish my work at hand.
A．can B．may C．must D．should
Because they usually receive the same score in the exams, there’s often disagreement as to ______ is the better student, John or Mary.
A．whom B．which C．that D．what
Some of the drivers were ______ by the police because of their good behavior in the traffic accident.
A．examined B．questioned C．praised D．punished
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
