Most students think they should have _______ at school if there were no examinations.

It’s hard to imagine an Olympic opening ceremony _____fireworks exploding in the night sky.[ ]

I prefer ________ at home rather than_________ out for a picnic on a rainy day.

The advanced worker, _____ to devote himself to the factory, has succeeded in developing new techniquesof production [ ]

Their coming without notice really our difficulties.