--- Have you really been to visit the Bird’s Nest in Beijing?
---- I ______ it last summer vacation.
A. do visited B. do visit C.did visited D. did visit
Ten minutes had been made full ____ of ____ the problem.
A. using; studying B. use; to study
C. to use; to study D. use; studying
These flowers are pleasant to ______.
A. be looked at B. look at C. looking at D.for looking at
Tom’s dog became ill and died,____ made him very lonely.
A. this B. that C. which D. what
Rather than ______ on a crowded bus, he always prefers a bicycle．
A．ride; ride B．riding; ride
C．ride; to ride D．to ride; riding
----Do you know our town at all?
----No, this is the first time I ____ here.
A. have come B. was C. came D. am coming
