—_________ do you go to movies?
—Once a month..
| A．How often | B．How far | C．How long | D．How soon |
We go _____ duty at 8 a.m.
| A．on | B．in | C．at | D．for |
Li and I arrived ______ Heishan country safe and sound, all is well. Don’t be worry.
| A．in | B．on | C．/ | D．at |
The kids are doing some experiment ______ the farm in the country.
| A．in | B．at | C．on | D．for |
We are listening the weather report _____ the radio.
| A．over | B．in | C．with | D．from |
Sandra said she would be back _____ this morning.
| A．in | B．on | C．at | D．/ |