To a worker, ________ from the point of view of society is necessary labor is from his own point of view voluntary play.

The traffic was held up for more than thirty minutes, ________ caused me to arrive late.

Motivation and personality may ________ the varying d egrees of success in one ’s career.

Since the premium varies with the scope of ____ extra premium is for buyer ' s account, should additional siske covered?( )

We shall be glad to receive you offer  ___ walnut meat, shipme nt,____ September/October; _____ tran sshipme nt at Hongkong.