The manager was very angry, for he had sent his business partner two thousand machines yesterday, half of _________ unqualified.

___ waiting for the bus.

The aged are close companions, and many of       have known each other for decades. 

 We arrived at the station too early and had         to go, so we sat there and chatted with each other.

—When can we come to visit you?—Anytime you feel like                .