Our physics teacher told us light __________ fasterthan sound last term.

_________ no doubt that a green campus plays an important role in the growth of students, both physically and mentally

Mary is hard-working. She works harder thanclassmates in her class.

The former (先前的) secretary was not equal to the job. But to my annoyance (恼火), the new secretary is _______ qualified (胜任的) for the job than her.

Is this raincoat yours? —No, mine _____ there behind the door