—When did the terrible earthquake in Lushan happen?—It happened ________ the morning of April 20, 2013.A. in B. at C. on
This book is not_______for a six-year-old child to read.
You can________the cake_______ten pieces.
The chairperson is very modest.He never_________.
I hope you can________me.
Helen spent ______ time studying English than I did.