The World Health Organization has given some advice on________to protect us from being infected(感染)with H7N9.
Here_____theresultsofthestudentactivity surveyatGreenHighSchool.
You _______ seeadentistwhenyouhaveatoothache.
--_____doyoushop? --Ishopeveryweek.
MaybeI’mnotveryhealthy,___Ihavehealthyhabits.
IthinkI’m_____unhealthy.