—Do you know the differences ________ the three words? --Sorry, I don’t know.
We want to know whether the drug has an effect _______________ people's health.
____________their hats into the air, the fans of the winning team let out loud shouts of victory.
Mr. Harris apologized ___the children ____ the lady _____ what they had done.
When I entered, I found my father ______ on the sofa and ______ in a magazine.
I haven’t seen you since you came back from holiday. ________ a nice time?