Whenever I see the bird,I'll _____ flying in the sky.
四个选项的含义分别是:think up 想出;dream of 梦想;work on 从事;pick up 捡起。结合本题语境可知,每当我看到鸟,我都梦想在天空中飞翔,故答案为 B。
I invited her _____ together,but she didn't agree.
句意:我邀请她和我一起唱歌,但是她没有同意。invite sb. to do sth. 意为“邀请某人做某事”,故答案为 C。
—I want to return the book to Jack,but I can't find him.
—He _____ the library. You can find him there.
根据题干中的“我想把这本书还给杰克,但是我找不到他”可推断,答语的含义是“他去图书馆了,你可以在那里找到他”,根据这个场景可知,杰克不在说话人处,他去图书馆了,现在仍然在图书馆,have gone to 符合题意,主语是 He,故答案为 B。