Choose the right words to complete the following sentences and make changes where necessary.

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)