I thought she was famous, but none of my friends have ______heard of her.      

The lively boy suddenly appeared to be ________ quiet, so his mother knew something unusual must have happened.

The city of Jilin is beautiful all the year around,         in winter. The Jilin rime attracts plenty of tourists.

— Do you think we’ll get somewhere in he future.— I believe it’s quite_____ that we’ll make a difference so long as we work harder.

The Internet has brought _____ big changes in the way we work．