Clothing made of man-made materials has advantage over _______ made of natural ones like cotton, wool or silk.

I can’t stand _______ when people litter around in public places.

Although Rosemary had suffered from a serious illness for years, she lost______ of her enthusiasm for life. 

I felt so bad all day yesterday that I decided this morning I couldn’t face ________ day like that. 

(2013·福建毕业班质检)—Shall I attend my friend's coming­of­age ceremony, Mum?—No, unless you see to ________ that you will be home before 10：00 P．M.