When did your father ________ your uncle’s home last night?
If the kids stay indoors all the time and get no exercise, they _________ weak.
At the meeting the boss was explaining his plan while his secretary_________ the notes.
Mr. White spent about one hour and a half _________ the accident report yesterday evening.
To live a green life, we try_________ more energy and produce less pollution.
In recent years the environmental pollution has been _________ than before.