Last month I was lucky enough to have a chance to make a trip into _____ space with my friend Li Yan ping, _____ astronomer.
They didn't allow ________the camp without a special pass.
If you leave,I'll have ________friends here,so I won't stay________.
Jack ________the bus as soon as it stopped,then to his joy he met his best friend at the station.
After his journey from abroad,Richard returned home,________.
Since you have seen both runners,________?