—It is rather cold here. Shall we light a fire? —No, we ______because things are easy to catch fire.
The speaker mentioned some writers and books _____ were known to us.
-----I called you at about half past eight last night but nobody answered. -----Oh, I _____ in my office at that time.
The number of deaths will be reduced greatly if people _____ to eat more fruits and vegetables.
-----You’ve left the light on. -----Oh, so I have! _____ and turn it off.
Tom insisted that what he said _____ true, and insisted that he _____ punished.