—We’ll have a hiking trip, but when shall we meet?--Let’s make it _____half past eight ____the morning of June 21.A at; in B./; in C./; on
My father decided to _______drinking.
Some ______are ______their time to help the poor in underdeveloped countries.
We need to _______a plan for the coming party.
Could you help _______ the classroom? It’s dirty.
I want to _______ kids_______ their school work.