选择方框中所给的单词的适当形式填空，每个单词限用一次。

hope   cheer   cross    for    job

I ________ to be a volunteer (志愿者) in a small village.
Look! The old man is walking__________ the street with his grandson.
Li Fang lives alone in the city. She pays 600 yuan _____ her house rent(房租) every    month
In the future, the robots will do many heavy________ ,so people will have a lot of free  time.
The students will ________ the class monitor when he appears (出现).