Much to our _____, China won 51 gold medals, more than any other nation, at the 2008 Beijing Olympic Games.
2. ______was known to them all that William had broken his promise______ he would give each of them a gift.
3. —How long are you staying there? — _____depends.
4. I hate _______ when young people speak to the elderly in a rude way.
5.Is ____ necessary to complete the design before National Day?
6.I don’t think ____ possible to master a foreign language without much memory work.