Mr. Smith, _____ of the _____ speech, started to read a novel

.－Did you have a good sleep last night?－Yes, never sleep ____．

Experts warn that global warming will cause climate changes, including more ______ floods, heat waves and droughts. 

He is very popular among his students as he always tries to get them ________ in his lectures.

To work from home, which one could hardly imagine, has been made         with the development of computer technology.