When chatting with a stranger on the Internet, bear in mind______ he could be anybody, for you can’t see him _________

The experiment shows that proper amounts ofexercise ,if _______regularly, can improve our health.

This shop is the one _______ sells men’s clothes.

Thank you very much.——-My pleasure. I’m glad to have been _______.

The new CRH train between Beijing and Shanghai _______ speed can reach about 380km/h will benefit people a lot.