—Have you been to the Great Wall?
—Perhaps not in my memory; ____, it might have been during the early childhood.
A. if any B. if so
C. if ever D. if not
It was reported that a little boy under a destroyed house for three days was pulled out alive at last.
A．trapped B．being trapped
C．was trapped D．had been trapped
The room___ 10 meters across is large enough for a single man to live in.
A. being measured B. to be measured
C. measures D. measuring
He is a strict and kind teacher, ______ my son loves and respects.
A. one B. the one who
C. which D. he who
Helping others is a habit, ___ you can learn even at an early age.
A. it B. that
C. what D. one
--Our English teacher is back home from Britain now.
--Yes, she _____there for just three months.
A. has been B. had been
C. is D. was
