At the routine office meeting, the headmaster insisted that the problems ____________ paid special attention to.
A. referred to B. referred to be
C. refer to being D. refer to be
As is often the case, little Tom, if ____________, is most likely to stop crying soon.
A. left ignoring B. left ignored
C. leaving ignoring D. leaving ignored
Never before ____________ seen anybody who can play tennis as well as Robert.
A. had she B. she had
C. has she D. she has
You may ____________ it that Jennifer will come and help us if we are in trouble.
A. base on B. rely on
C. carry on D. hold on
The present situation is very complex, so I think it will take me some time to ____________ its reality.
A. make up B. figure out
C. look through D. put off
Experiments of this kind____ in both the U.S. and Europe well before the Second World War.
A. have conducted B. have been conducted
C. had conducted D. had been conducted
