When in trouble，remember to stay calm，and everything will well

It was not until the subprime loan crisis (次贷危机) ____ great damage to the American financial system that Americans ____ the severity of the situation.

I think he falls asleep already, _________ I’m not completely sure.

What can she do—She can ______ Chinese kung fu.

If eating makes you feel better, you can go to your favourite restaurant to have a nice meal. The sentence elements(成分) of the underlined parts is_______.