根据句子意思，用括号中所给单词的适当形式填空。
For her    ▲  (twelve) birthday, Jenny invited her teachers and classmates to her house.
—How was your visit to Nanjing Confucius Temple at the weekend?
—Wonderful! My parents and I enjoyed    ▲  (we) very much there.
After several    ▲  (week) study, the American students found Chinese interesting to learn.
You can see the    ▲  ( happy) on her face because she can’t find her lovely cat.
When a little bit of rain falls, the plants hold the water. Without plants, the land can become a desert much    ▲  (easy).
—May Day is coming, would you like to go    ▲  (climb) with us?
—Why not, I’d love to go to Zijin Mountain.