58It is said that a collection of paintings by David is _____ exhibition at the Museum

Oh, dear. What happened?—I ________ on the shiny floor and fell.

Mr Smith，______of the ______speech，started to read a novel.

In order to deal with her tough assignment, she preferred __________ at weekends.

In case of fire, stay low to the ground in a smoky room, ________ smoke always rises towards the ceiling