The boss insisted that every minute ______ made full use of ______ the work well.
If the new safety system _______ to use, the accident would never have happened.
had been put
were put
should be put
would be put
People______better access to health care than they used to,and they're living longer as result.
will have
have
had
had had
Jim has retired, but he still remember the happy time _______ with his students.
to spend
spend
spending
spent
The little problems ______ we meet in our daily lives may be inspirations for great inventions.
that
as
where
when
The national park has a large collection of wildlife, _________ from butterflies to elephants.
ranging
range
to range
ranged