John has got a very good job in the government. 　 — _____ he looks so happy.

They are____Nanjing now. [ ]

I like the trip ______ the zoo. [ ]

The Acropolis was constructed in the 5th century BC ______ a high altitude above the city _____ Athena, the goddess of Athena.

Attention, please. The plane has to be _________ because of the foggy weather.— Oh, bad luck! We have to wait now.