A．It’s hard to know what to believe about it.
B．He doesn’t believe it’s hard for everybody.
C．It’s even harder than people say.
D．It’s not as hard as he’d thought.

A．They bumped into each other over a swimming pool.
B．They avoided each other by turning in different directions.
C．They narrowly escaped crashing into each other.
D．One plane climbed above the other at the critical moment.