I can't tell you the exact when I will get there ____, I’ll be there as early as I can.

By the time the fire-fighters arrived, the fire had been put＿＿＿by the teachers and the students. 

Smiling doesn't     mean you're happy． Sometimes, it just means that you're strong enough to face problems．

 The two sisters are_______ different in character --- one talks a lot while the other is a girl of few words.

Medicine depends on other fields for basic information, particularly some of their specialized branches.