If you want to study the nature of the universe, first of all, you must be clear about its ________.
Mike pretended ___ Chinese when I came into the classroom.
We thought Tom wouldn't pass the exam, but to ___, he passed.
As she ___ the newspaper. Granny ___ asleep.
I don't really work here; I ___ until the new secretary arrives.
It ___ that Napoleon always asked the same three questions, and usually in the same order.