Postage______,thenecklacewillcostyouatleast650yuan.

Theprofessorcouldhardlyfindsufficientgrounds_____hisargumentsinfavorofthenewtheory.

This robot is supposed to save a lot of labor, but it remains a problem if it ______.

We all think that _____ no need to make laws to prevent the young from getting married during their college life.

______whichwaytotake,thelittleboybehavedlikearealgentlemanwhocomfortedhissisterfromtimetotime.