A Tale of Two Cities is ______ a novel. It helps us to understand the history of that time.

I felt it hard to keep up with my classmates. But whenever I want to ____________, my teacher always encourages me to work harder.

Can you play ping-pong?—No, I can’t. It’s_____.

E-mail is much ______than long-distance calling.

To ______ surprise, I got an A in my English test.