These days Andrew has spent as much time as he________the final exam. [ ]

When you rewrite the paragraph, I advise you to______ the last sentence as it is rather misleading.

It suddenly occurred to him________ he had left his keys in the office.[ ]

_____ they visited the Science Museum，they showed great interest in everything they saw. [ ]

MrLi, who _____ his whole life to education, is retiring next month