______ is necessary for everyone to obey the traffic rules.

Go and make someone laugh —______just might help them live longer.

---I’m going to do        for your party. ---Sounds great!.

“There’s coffee and tea; you can have _______.” “Thanks.”

 — It is a pity that we have nothing to refer to when we come across new words.— I quite agree with you. There isn't any dictionary around when we need ______.