（1）The barkeeper c________ me 40 yuan for the beer last night.

（2）Overuse of weight - loss pills may cause liver f________.

（3）The Johnsons are making p________ for the coming Thanksgiving.

（4）Mr. Wang and his children often ________ (探索) the surrounding countryside on weekends last year.

（5）You can book railway tickets 21 days in ________ (提前) during the Spring Festival.