As is known to all language learners, the newly learnt words will soon be forgotten unless______ used in everyday communication.

She seems_     happy in her new job since there is nothing troublesome to bother her. 

New digital mobile phones definitely produce less radiation, but that doesn’t ______ mean that they should be used without caution. 

There is still much to discuss. We shall, ____, return to the problem next time.

 — Do you know the reason why the Whites got divorced? — No, they haven’t quarreled with each other since they got married. _______, they broke up finally.