【推荐1】The letters were used as source ________ (materialism) in this new biography. (所给词的适当形式填空)

【推荐2】We must provide good ____________ (material) for developing the students’ reading skills. (所给词的适当形式填空)

【推荐3】The factory used 65 percent of the raw materials,the rest of which________(be) saved for other purposes. (所给词的适当形式填空)

【推荐1】Hungry bears may be congregating (聚集) around human ________ (settle), leading to the illusion that populations are higher than they actually are. （所给词的适当形式填空）

【推荐2】We have received hundreds of job ________（application）so far. (所给词的适当形式填空）

【推荐3】This is an original play, not an ________ (adapt).（所给词的适当形式填空）