Do you have any idea what Paul does all day? — As I know, he spends at least as much time playing as he _____. [ ]

The book, ________ to tell people how to learn English as ________ second language, is very helpful for beginners.

When this new kind of virus broke out at first in Mexico, no one had the least idea that it would _______ so rapidly throughout the world.

Jeffery said he to the get-together the next day, but he didn’t．

34 We are living in an age ____________ we treasure very much, because it sees man’s rapid development