You ______wash your hands before meals.

The leaders of the Chinese mainland and Taiwan met in Singapore ________ November 7, 2015.

Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ___________ we should deal with properly.

Ｗill there be more people in 100 years ,do you think so

— Would you care for a cup of coffee? — I ________ one. Thank you just the same. [ ]