could not skate at

could not skate at The ice was so thin that peopie could not skate on it.(改为同义句 the ice on the lake was so thin that people could not skate I am not good at ___(swim),but I am good at ___(skate) I could not see anything at all You could not burn at both ends at all she could (skate) when she was ten You (not) like (skate),but I like (skate). I could not talk in English at all中文翻译 he was b--------at birth,he could not see anything The young doctor could not sleep at night ,his thoughts__him He could not help _______ at the joke.