use, using, used, hear, hearing, heard He tried ___ a new micr

use, using, used, hear, hearing, heard
He tried ___ a new microphone and was able to make himself ____
【正确答案】：using; heard
【题目解析】：【考点点击】本题考查动词的非限定形式。【要点透析】由于此句用的是过去时态,所以第一个空用 try doing sth.来表示“尝试着做某事”; make oneself done意为“使自己被…”,make后常跟 known/understood/heard等过去分词,用来表示“使自己被别人认识/理解/听到”。