He is ready to help others, seldom, ______ refusing them when they turn to him.[ ]

The shoes in the box _____ too big. Would you please show me _______

There was a lot of fun at yesterday’s party. You______come, but why didn’t you?

The kidnapped American captain was rescued from the Somali pirates（海盗）. — But for the help of the US Navy, he _______ freed then.

Samsome knowledge of the computer just by watching others working on it．