根据句子意思，用括号中所给单词的适当形式填空。
【小题1】For her twelfth ▲ (twelve) birthday, Jenny invited her teachers and classmates to her house.
【小题2】—How was your visit to Nanjing Confucius Temple at the weekend?
—Wonderful! My parents and I enjoyed ourselves ▲ (we) very much there.
【小题3】After several weeks’ ▲ (week) study, the American students found Chinese interesting to learn.
【小题4】You can see the unhappiness ▲ ( happy) on her face because she can’t find her lovely cat.
【小题5】When a little bit of rain falls, the plants hold the water. Without plants, the land can bee a desert much more easily ▲ (easy).
【小题6】—May Day is ing, would you like to go climbing ▲ (climb) with us?
—Why not, I’d love to go to Zijin Mountain.
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解析：
【小题1】考查序数词。第十二个生日，应该用序数词。Twelve的序数词形式是twelfth。故填twelfth。
【小题2】考查固定短语。enjoy oneself“玩的开心”。根据we可知，应该用复数形式ourselves。故填ourselves。
【小题3】考查名词所有格。名词要先变复数，再加“’”。故填weeks’。
【小题4】考查名词形式。根据can’t find可知，是不开心。happiness“开心”，反义词是unhappiness。故填unhappiness。
【小题5】考查比较级。修饰动词bee用副词，easily的比较级是在前面加more。故填more easily。
【小题6】考查固定短语。go+doing表示“去做某事”。故填climbing。