Could you please tell me how to improve my spoken English—— Certainly，I ________.

He’s got himself into a dangerous situation ______he is likely to lose control.

They are still very cautious about ______ side effect the new medicine will bring about, although the experts have tried it on about 2,000 patients.

Good afternoon!— !

— What have you been busy with these days?— I ______ that the speech contest has been brought forward, so I ______ for it. [ ]