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

Thinking that the students were having an evening class, the teacher left the classroom, _____.

---Volunteering is becoming           popular in China .--- Yeah, people are now aware that helping others is helping themselves.

She devoted herself _______ to her research and it earned her a good reputation in her field. 

Though there was a heavy rain and terrible thunderstorm, the children slept  _____all night.