I have been working here since I _______ this new position.
Listen!, his family must be quarreling, _______?
We read them ________; we remember them________.
Doctor Brown says that _______ what forceful arguments against cigarette harm there are, many people insist on smoking.
The government has taken some measures to solve the shortage of electricity, but it may be some time _______ the situation improves.
They are always ready to give the vacant seats to _______ comes first.