The ______ of new inventions(发明) should be to make life easier, not to make it more difficult.

______ vegetable oils are better than animal oils.

I’d appreciate____if you would like to teach me how to use thecomputer.[ ]

Tom, _________ afraid of speaking in front of people. You are the best one.

My aunt has ________ 11-year-old son. She loves ________ very much.