Theprofessorcouldhardlyfindsufficientgrounds_____hisargumentsinfavorofthenewtheory.

I heard that you really had a wonderful time at John's birthday party, _____?

My train arrive in New York at eight o'clock tonight. The plane I would like to take from there ______by then.

"______thefriendshipbetweenourtwopeoplelastforever!",andwiththissincerehope,thepresidentconcludedhisspeech.

Modernscienceandtechnologyhas_____communicationbetweenpeoplefarapart.