A. 用括号中所给词的适当形式填空，使句子完整、通顺。
【小题1】Don’t ________ (smoke) here. You’d better go somewhere else.
【小题2】I’m very sorry for what I ______ (say) just now.
【小题3】He tried his best _______ (win) the ping-pong game.
【小题4】Tom enjoys ____________ (play) basketball after school.
【小题5】Last Saturday, I had great fun __________ (climb) Mount Tai.