_____ to the party, Joan was greatly hurt.
A．Having not been invited. B．Having not invited
C．Not having been invited D．Not having invited
________we went to visit Professor Smith, he________his research work.
A．The first time; devoted to B．Whenever; was concentrate on
C．For the first time; was busy with D．Each time; was absorbed in
A true gentleman is always _______ with himself and tolerant with others.
A．strict B．cautious C．enthusiastic D．positive
—What about the student in your class, Mr. Wang?
—The doctor said that ________ sleep caused him poor memory and poor concentration.
A．lacking of B．lacked in C．lacking D．lack for
____________ many times, but he still couldn’t understand it.
A．Though he had been told B．Having been told
C．Having told D．He had been told
It was in the lab_________was taken charge of by Johnson_________they did the experiment.
A．where; which B．which; that C．which; which D．that; which
