This old computer must have been of great use to _______ did the scientific research.
With so many things __________ for her baby, the mother made a shopping list before going to the store.
__________ is known to everyone, the moon travels round the earth once every month.
My friend knows where he can __________ a good used car for you at a very reasonable price.
Your performance in the driving test didn't reach the required standard, __________, you failed.
—Why didn't she ask for help at that time? —You know, at such midnight, there was no one __________.