_______,but it is also a great way to lower the number of greenhouse gases in the air.
Jack became seriously ill after ________ in polluted air for many years.
The new secretary is supposed to report to the manager as soon as she ________.
She ________ down beside me and soon fell a deep sleep.
What ________ did the doctor write you?
My mother always gets a bit ________ if we don't arrive when we say we will.