Choose the right words to complete the following sentences and make changes where necessary.
1) Since the conference was held on Chinese--------,security was no problem.(soil,earth)
2) The ------- here is sandy,and therefore,very poor.(soil,earth)
3) He is so strong that he can carry four basketfuls of-------- at a time.(soil,earth)
4) He is a down-to-------- sort of fellow.(soil,earth)
5) His face is ------- me but I can’t recall his name.(familiar with,familiar to)