If we_________ sunlight_________ a dry leaf with a piece of glass, it may start burning.

--- Why didn’t Mr. Smith arrive on time for the meeting?--- He must have been ________ on his way here in the traffic jam. 

. We all demanded the new type of machine ____________   put into use as soon as possible.

The little chick ______ the earthworm, deciding whether to swallow it or let it go.

If the motorbike driver had slowed down when he turned, the accident could have been _____．