题目

阅读下列短文，根据短文内容填空，在未给提示词的空白处仅填写1个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。It looked like rain. The sky 【1】 (be) gray. It was almost noon, but the sun was hidden by a gray cloud. It was cool. There were no birds 【2】 (fly) anywhere. Bob 【3】 (walk) outside talking to Bill at that time. They both had their 【4】 (hand) in their pockets. They knew that it was probably going to rain shortly.在括号里填上合适的单位。一支铅笔长16（________）；数学书厚8（________）；一箱苹果重12（________）；把饭蒸熟要20（________）。