56. Some _____(妇女) scientists are talked about in Unit One, Book Four.
57.The big tree provides _____(树荫) for the villagers in the summer.
58.There is still much to discuss. We shall, ____(因此), return to this item at our next meeting.
59.Don’t play in the sun for too long, or you may get _____(晒伤).
60.She sounded very _____(有说服力的) to me.
