Today the Red Cross provides a number of services for the public, such as helping people________, teaching first aid and providing blood.
Have you ever been in a situation _____ you know the other person is right yet you cannot agree with him?
You _____ Jim anything about it. It was none of his business.
Professor Johnson is said _____ some significant advance in his research in the past year.
—You must obey every word of mine!— _____ I don’t?
When you have finished with that book, don't forget to put it back on my desk, _____?