In the cross-lake swimming race, a boat will be ____in case of an emergency.
This Englishman is good at writing, reading and _____ is kind to others.
What he said,_____, has nothing to do with what he did.
—— There will be a storm soon. —— I am afrai?_____.
_____ heat is different from temperature?
_____ his face, the young man must be over 20.