. He ate what he could, and gave the _____ of the food to the birds.
People try to avoid public transportation delays by using their own cars, and this ________creates further problems.(2007· 湖北)
I guess we've already talked about this before but I'll ask you again just ________.(2010·浙江)
.Life is too short to waste and too ________ to give up.
The law required that everyone ________ his car checked at least once a year.
.Our teacher is very busy.He is ________ in working out a teaching plan.