We must try our best to stop the pollution a happier life.
It takes my mother much time _________ every day.
There ______ a funny cartoon on CCTV 6 this evening.
--What did you say just now? --I asked you ______.
The actress is already 50, but she looks ______ than she really is.
-- Lisa was seen ______ an old man go across the street this morning. --What a kind girl she is!