—______ do you walk your dog?
—Sometimes.
| A．How many times | B．How often | C．How long | D．How soon |
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．/ |
Do they work _____ the day time or _____ night?
| A．at; in | B．in; at | C．on; at | D．at; on |
Lily had left ______ the time we arrived.
| A．at | B．on | C．by | D．in |
He arrived _______ Shanghai _______ the morning of January 5.
| A．at; in | B．in at | C．for; on | D．in; on |