Tom ______ carefully,but he________ nothing.

Tom ______ carefully,but he________ nothing. my mom () carefully,but she () nothing 单项选择： She ... carefully , but shi ... nothing. 改错I listened carefully,but nothing heard. I_____carefully but could ______ nothing. He ____ the radio carefully,but he ____ nothing. 选 择 ------ her carefully ,but I --- --nothing .见下面补充 I __ very carefully,but I can ____ nothing. I looked carefully but saw nothing 我注意看了但是什么也没有看到 1.Jack ____ carefully but he can ___ nothing in the room. I listened carefully but I heard nothing各个单词在句中起什么成份? 1.he ()carefully ,but he ()nothing.A listen ,hear B listen ,