用方框中所给词语的适当形式填空。每词限用一次。

fail knife exactly thanks to himself

（1）Every time when she 　    　，Jane tells herself not to give up.

（2）　     　 the high﹣speed trains，our journey becomes much shorter now.

（3）Many people can't remember 　   　 when their mothers' birthdays are.

（4）Western people eat with　    　 and forks while Chinese people use chopsticks.

（5）Bob told his parents that he could look after 　   　even when he was home alone.