He made another wonderful discovery,_____ of great importance to science.
A．which I think is
B．which I think it is
C．which I think it
D．I think which is
When the poor old lady tried to ______ the cup on the shelf to have a drink, she ______.
A．reach for; fell down B．reach; fell down
C．reach for; had fallen down D．reach; was falling down
Maria has written two novels, both of _____ have been made into television series.
A．them B．that C．which D．what
Mary is ill today. If she ______ ill, she _______ absent from school.
A．weren’t; couldn’t be B．wasn’t; wouldn’t have been
C．wasn’t; wouldn’t be D． weren’t; won’t be
Mary had promised to give me a ticket for tomorrow. She failed, ______.
A．but B．too C．either D．though
The policeman came up to the house, whose door was open, _____ there for a while, and went in.
A．to stand B．standing C．stood D．stand
