关键语法
（1）She was waiting for him________(go)home．
（2）When it rained yesterday，she________(walk)to school．
（3）What were you doing when you________(hear)the exciting news？
（4）Remember________(turn)off the TV when you leave the room．
（5）On this day，Dr.Martin Luther King________(kill)．
（6）We were________(surprise)to hear that news．
（7）It has________(mean)to most Americans．
（8）They walked to school in________(silent)．
（9）When I walked by the classroom，I heard the students________(read)books aloud．