The teacher asked us not to______ our books or dictionaries when we are in the exam.
The new CRH train between Beijing and Shanghai ________ speed can reach about 380km/h will benefit ________ takes it.
The companies are working together to create ________ they hope will be the best means of transport in the 21st century.
What some people don't realize is ________ difficult life can be after they get addicted to drugs.
Don't put off till tomorrow ________ you should do today!
—Don't you believe me?—________, I'll believe ________ you say.