The book is very valuable to us. That is to say, The book is of________.

Do you think they are _______ football players—Yes, they can play football very ________.

It will be another 50 years ______ our country is expected to reach the level of a medium developed country

lot of people ______ the theory that acupuncture can produce chemicals in the body which reduce pain.

She’s too thin. She ________ gain some weight but she ________ too little. [ ]