In the past few years, My Heart Will Go On was a popular song among young people, ____ were often heard singing it at parties

Following the girl, we went into a hall, on ____ walls hung a few pictures of some famous scientists．

Are ________ your friends —Yes, they are.

We should consider what use can we make ______ such material

We plan to go out for a picnic next weekend. Would you like to come along— ______. It’s my favorite.