—Look! There are lots of old people in the park.—They look relaxed. Some are playing the card , ___________ are chatting.
The kids are doing some experiment ______ the farm in the country.
We are listening the weather report _____ the radio.
Sandra said she would be back _____ this morning.
Do they work _____ the day time or _____ night?
Lily had left ______ the time we arrived.