1.When I came across that poster, a good idea suddenly ________ (occur) to me.
【答案】occurred
【解析】考查谓语动词时态。句意：当我偶然看到那张海报时，我突然想到一个好主意。从句的谓语动词came across用一般过去时，主句的谓语动词occur也要用一般过去时，故填occurred.
2.When the dog attacked him, he __________(defence) himself from attack with a stick.
【答案】defended
【解析】考查时态。句意：当狗攻击他时，他用棍子自卫。根据When the dog attacked him可知叙述的是过去发生的事情，故应用一般过去时；defend...from..表示“防卫……以免于……”，固定短语。故填defended.
