What are you looking for —I’m looking for the book _____ you lent me yesterday。

_____ crying sadly, he raised his head and let tears stream down his face on purpose. [ ]

We would like to drop in at your house if___________

Why do we get up so early— If we _______ the flight we would have to stay here for another day.

What should we _______ in class We should pay attention _______ notes when necessary.