完成句子
①我突然想起我昨天见过他。
____________________________________ I saw him yesterday.
②当二战爆发的时候，他还在德国。
When the Second World War ____________________________________, he was in Germany.
③我不明白你怎么会又迟到了。
I didn’t understand how it ____________________________________ that you were late again.
④他专心致力于科学。
He __________________ science.
⑤我期待着你下周的拜访。
I _______________ your visit next week.