请根据句意从方框中选用合适的单词，并用其适当形式填空，使句子通顺。
they ninety little invent usual
【小题1】Simon and Linda looked at each other and kept their secret to .
【小题2】This is really an experience. I will never forget it.
【小题3】Grandma’s birthday is ing. We are going to hold a party at her home.
【小题4】Computer is one of the greatest in the world. I can’t imagine what life is like without it.
【小题5】Of all the students, our monitor spent the time but made the most progress.themselves
网友回答
(答案→)themselves
解析：
【小题1】keep secret to oneself表示保守秘密的含义，故本句空格处填他们的反身代词themselves。
【小题2】本句的含义为这的确是一个不寻常的经历，故本句空格处填不寻常的形容词unusual。
【小题3】本句的含义为祖母90岁的生日即将到来，表示某人生日可用序数词来表示，故本句空格处填90的序数词ninetieth。
【小题4】本句的含义为电脑是世界上最伟大的发明物之一，故本句空格处填名词发明物的复数形式inventions。
【小题5】本句的含义为我们的班长花费了最少的时间，但取得了最大的进步，故本句空格处填最少的修饰不可数名词的单词least。