1. It was in the lab _____ was taken charge of by Professor Haris _____ they did the experiment.
A. where. that B. that; where C. which; that D. which; where
2.----- Are you a teacher? ------- No, but I ______.
A. used to B. was used to C. used to be D. used to do
3.It’s a good habit to keep everything ______in your study.
A. in the way B. in place C. in hand D. in case
