When you________, use a handkerchief to cover your nose and mouth. This is particularly necessary in public places.
| A．speak | B．whisper | C．sneeze | D．breathe |
However, it only appears in the imagination and will never be ______.
| A．realized | B．supported | C．understood | D．produced |
Travelling west, you set your clock ______; travelling east, you set it ahead.
| A．behind | B．forward | C．back | D．ahead |
— Look! How long _____ like this?
— Three weeks! It’s usual here that rain _____ without stopping these days of the year.
| A．had it rained; pours | B．has it been raining; pours |
| C．is it rained; is pouring | D．does it rain; pours |
Mo Yan said he would never forget those years ________ he lived in his hometown with his family, ________ has a great effect on his life.
| A．when; that | B．that; which | C．which; who | D．when; which |
A man does not know the difficulty of anything _______ he does it personally.
| A．although | B．if | C．because | D．unless |