Bats are surprisingly long-lived creatures, some ____________ a life span of around 20 years.
Many airlines now allow passengers to print their boarding passes online ______ their valuable time.
save
saving
to save
saved
Jane moved aimlessly down the tree-lined street, not knowing ______she was heading.
why
where
how
when
______ birds use their feathers for flight, some of their feathers are for other purposes.
Once
If
Although
Because
-______ that company to see how they think of our product yesterday?
-Yes. They are happy with it.
Did you call
Have you called
Will you call
Were you calling
Every year, ______ makes the most beautiful kite will win a prize in the Kite Festival.
whatever
whoever
whomever
whichever