This is a clean chair.Please sit ( ).(填介词) Give him a cup ( )fruit juice,please.(填介词)

问题描述:

This is a clean chair.Please sit ( ).(填介词) Give him a cup ( )fruit juice,please.(填介词)

This is a clean chair.Please sit (down ).(填介词) Give him a cup (of )fruit juice,please.(填介词)