乘坐飞机是最安全的旅行方式之一。

Flying is one of the ___safest ways to travel.

在陌生城市里，乘坐出租车是最安全的选择。

Taking a taxi is the ___safest choice in an unfamiliar city.

目前最安全的做法是把钱存入国有银行。

The ___safest option now is to deposit money in state-owned banks.