Smith wrote an article on ____ he failed topass the exam.

late for work this morning.—_________. You started early, didn’t you

On snowy days, you have to drive very ________ toavoid traffic accident.

You may find the key to the math problem on page 107．—Ah, it’s so simpleI wonder why I _of that

72. We couldn’t read the notice on theboard because several people were standing _______ it.