The boy was able to __________ himself when he was very young.

We are going to organize a talent show to ________ some extra money for charity.

What do you think of the four classics (名著)of China?－I hear that they are wonderful, but I’ve read _______ of them.

I think math is not ________ science.

My pen pal Molly ______ to Xi’an to visit me next Thursday.