1 . He lives in a hotel,________is only five minutes’ walk from here. （用适当的词填空）

2 . I was asked to explain the project with the help of a flow chart, ______ was a big challenge for me.(用适当的词填空)

3 . There is nothing we can to help Linda, ______ circumstances are beyond our control.(用适当的词填空)

4 . I am ________ (occupy) with my occupation, which occupies most of my time every day. （所给词的适当形式填空）