The old man was taking a walk, ____ by his grandson. 

In the terrible dream he found himself on the surface of a strange animal but it ______ to be his own pillow. 

—The rain ________ fast and heavy.—You should ________ some shelter. Look at you—you are all wet.

--How did she get infected? --She ________the virus without any protection.

I _____ to go to see my former class teacher, but it was raining cats and dogs that night.