The medicine works more effectively ______ you drink some hot water after taking it.
—He is a very hard-working student. — ______. As far as I know, he often burns the midnight oil.
The knowledge that his friends have deserted him is a (n) ______ pill for Mr. Smith to swallow.
Not having promoted the new digital camera successfully, the company should ______ its original marketing methods.
Sometimes smiles around the world ______ be false, hiding other feelings like anger, fear or worry.
Was it not until you began to write ______ you should have remembered more words?