They will try their best in the Dragon Boat Racing_______ they may fail.

John hasn’t come yet, I don’t know _____.

I’ll be away on a business trip. Would you mind looking after my cat?–Not at all._________.

The money collected should be made use the people who are in trouble.

－Will youplease help me to repair the computer now－Sorry, I’mtoo busy and I haven’t a minute to _______.