____ Great Wall is one of the seven wonders around the world．（　　）

A．TheB．AC．AnD．/

We are proud of our country． The year 2019 is her ____ birthday．（　　）

A．seventyB．the seventy

C．the seventiethD．seventieth

I think tea will taste better ____ some milk in it．（　　）

A．forB．withC．fromD．at

Fishing is one of ____ activities among the middle﹣aged people．（　　）

A．popularB．more popular

C．most popularD．the most popular

Nobody taught the old lady how to use Wechat． She learned it all by ____．（　　）

A．sheB．herC．herselfD．hers