How did you work out the difficult chemistryproblem— I worked it out by ________.

________ do you go to the supermarket, Amy — Once a week.

Usually _______ questions are longer, so we must use longer sentences to speak more ______ to others.

Fever, cough and headache are the common __________ of catching a cold.

His parents put a lot of effort intogetting him ____ to a key school