根据句子意思和括号中的中文提示填空，每空一词。
The tourists had no         (选择) but to wait for the next train.
I like this photo best because it         (使想起) me of my happy childhood.
I sent her an e-mail yesterday. But she hasn’t         (回复) to it.
Our teachers are all very         (严格) with us students.
In China, you have to be 18 years old before you are          (允许) to drive a car.