It’s very convenient ______ us to buy train tickets now because we can buy them either from the station or on the Internet.
My father is in Beijing for a long time. I’m really looking forward ___ him.
I’m going ___ a picnic on Saturday.
It’s ten o’clock. The children are ___ a good time.
My father works in a ________.His students like him very much.
Jim can’t go to school ___ his parents have no money.