根据句意和汉语注释,写出单词的正确形式。 小题1:I’m sorry to say that those shoes in your size are not ____________ at our shop. (可以获得的) 小题2:He ______________ hard after he finished the 200-metre race. (呼吸) 小题3:The shirt with blood on it is one of the _________________. (工程师) 小题4:Old people can’t get used to the new lifestyle _______________. (马上)