用方框中所给单词的适当形式填空。每词限用一次。
小题2:As a good student, he never plays computer ▲ . 小题3:In America, Mother’s Day is on the ▲ Sunday in May. 小题4:The first Chinese railroad was ▲ to build because it was in the mountains and there were many bridges and tunnels. 小题5:Every time I heard the other students ▲ and laughing, I felt my heart break. |