I will go on with the experiment unless my mother _____ me to stop.
| A．will ask | B．asks | C．asked | D．has asked |
What do you usually do ________ Christmas?
| A．on | B．at | C．in | D．for |
Mrs. Brown worded in the west of Australia ________ last summer.
| A．/ | B．on | C．in | D．since |
The first class begins _______ 8 o’clock ______ the morning.
| A．at/on | B．at/in | C．on /in | D．on/on |
_______the past two months he has been busy with his school work.
| A．For | B．On | C．Since | D．At |
________last Saturday, we had two football matches with Class Two.
| A．For | B．/ | C．By | D．During |