Mr. Zhang said that he would be punctual for the appointment, _______ he were late?

Water is very important _____ all living things. We must _____every drop of water.[ ]

I don’t think he’s so great, but Han Mei .

. –Mary, is this ______ umbrella?–No, it’s not mine. It is _______.

George W. Bush encourages the US soldiers to fight _______ their own country.[ ]