take a taxi还是take the taxi

　　I was forced to take a taxi because the last bus had left.

　　最后一班公共汽车已经开走，所以我只好坐了一辆出租汽车。

　　We'd better take a taxi.

　　我们最好乘出租车。

　　The hotel had a taxi waiting to collect us.

　　旅馆召了辆出租车等着接我们。