沉默表明他对这个话题不感兴趣。

Janeisrestless;sheis_____animportantphonecallfromherparents.

Peopletodayarehighlyconcernedaboutthequalityoftheairthey___(breath).

I_____him150dollarsandmustpayhimbacktomorrow.

Thetwinsaresoalikethatitsalmost___(possible)totellthemapart.