—It’s really a surprise th at the manager should have no idea about the plan.—Of course he doesn’t, for the plan was made in his          .

—Paul has gone abroad to try his luck.—In my _______, his decision is not wise.

As she walked along a         , a door suddenly burst open, as though forced by someone behind it.

You are working too hard. You'd better keep a ________ between work and relaxation.

As the quality of the city’s air continues to give rise to ______, the residents are encouraged to set off fewer fireworks.