Who is _______old man in _________ brown coat over there?—Oh he is Mr. Green, he is from France.

There __________great changes in our hometown in the past fifteen years.

How can I go to the supermarket, Paul?－ bike. It’s not far from here.[ ]

The girl sitting next to me on the plane was very nervous, for she before.

The research is so designed that once _____ nothing can be done to change it.