Complete the sentences with the given words in their proper forms(用括号中所给单词的适当形式完成下列句子)
【小题1】Do you go________ with your parents or your friends? (cycle)
【小题2】People sometimes________ the environment. (pollution)
【小题3】Firemen are __________ because they always help other people in need. (help)
【小题4】The Arts and Crafts room is on the________floor. (two)
【小题5】Alice is waiting for you at the________. (enter)
【小题6】Kitty will have a birthday party, so she is writing an __________ to Mary. (invite)
【小题7】_________, they got the right answer with the help of their teacher. (final)
【小题8】Friends of Earth tell us ___________ shopping bags. (reuse)