(2013·南京金陵中学模拟)I failed again，but my parents encouraged me and told me that failure________the mother of success

Shall I inform him of the change of the schedule right now?— I am afraid you _____, in case he comes late for the meeting. [ ]

_____ all the inventions have in common is ______ they have succeeded.

Of all the clothes stores, you can buy clothes _________in Dream Clothes.

6. The Olympic Games _____ held every _____years.