An interesting suggestion for measuring the atmosphere around the Mars has been put _______.
After the long journey, the three of them went back home,_______.
_______it is to jump out of an airplane at 10,000 feet!
Jenny hopes that Mr. Smith will suggest a good way to have her written English _______ in a short period.
It is one of the funniest things ______on the Internet so far this year.
We were going out for a Christmas meal together ______ the accident happened.