With the advances of technology, plastics have taken the place of many ________materials.[ ]

Tom came to work last Friday ,but no one has seen him since. —he have had an accident ?

For a long time they walked without saying____ word. Jim was the first to break ____ silence.

was in danger, a bright ideasuddenly ____ to me

Kevin, you look worriedAnything wrong ? —Well, I _____ a test and I’m waiting for the result