___________ volcanoes for many years, I am still amazed at their beauty as well as their potential to cause great damage.
A.To study
B.Studying
C.Having studied
D.Studied
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Even though we live in a high-tech age, it’s still impossible to predict theweather______.
A.Actively
B.accurately
C.Cautiously
D.originally
I took notes during the meeting, but I ______ a chance to write em into a report so far.
A.didn’t have
B.haven’t had
C.hadn’t had
D.won’t have
The opinion ______ learning is a lifelong process has been expressed by education experts throughout the years.
A.Which
B.that
C.What
D.how
The sign on the wall of the library says, “No magazine is allowed ______ out of the reading room”.
A.being taken
B.to take
C.to be taken
D.taking