I’ll never understand how it __________ that you were late three times a week.
The place _______ I visited last summer is just the place _______ I spent my childhood.
The machine has ______ again; I think we’d better buy a new one.
Recently I have bought an iPad on the website of taobao.com, _______ the price is very reasonable.
When he knew that he had passed the driving test, he smiled _______.
The plants are _______. Some day they will _______ forever.