填空题
根据括号内所给单词的正确形式填空。Thin as it is ，this（）（book）cost me eight dollars.
book
单项选择题 A desert is a place（）is（）nothing but sand．But a camel can walk in the desert for months without any food or water．
单项选择题 If you（）your belief，you promise to succeed eventually．
单项选择题 Life is（）ups and downs，my friend．
