—What a pity! Their experiment is a failure.—They ________ better under more favorable conditions.
A rescue worker risked his life saving two tourists who _________ in the mountains for two days.
are trapping
have been trapped
were trapping
had been trapped
In any unsafe situation, simply _________ the button and a highly-trained agent will get you the help you need.
press
to press
pressing
pressed
China's high-speed railways _________ from 9,000 to 25,000 kilometers in the past few years.
are growing
have grown
will grow
had grown
During the Mid-Autumn Festival, family members often gather together _________ a meal, admire the moon and enjoy moon cakes.
share
to share
having shared
shared
She and her family bicycle to work, _________ helps them keep fit.
which
who
as
that