用方框中所给单词的适当形式填空，使句子通顺、正确。每个单词限用一次。

stand  allow   tough  coach  spend

Sun Haiping is Liu Xiang’s__________and he trains Liu Xiang regularly.
What does UN_________for?
You won’t be__________to watch with our fans if that’s what you think.
Mike often _________his weekends going swimming with his classmates.
The basketball match lasted three hours. It was quite_________.