Hong Kong﹣Zhuhai﹣Macao Bridge， the world's longest sea﹣based project， brings people in those three cities within "one﹣hour living circle"．（　　）

A．aB．anC．theD．/

My 80﹣year﹣old grandma has learned to chat on WeChat!

Amazing! It's truly too late to start doing things．（　　）

A．alwaysB．neverC．sometimesD．usually

How time flies! The middle school life is coming to an end．

Yes． We have to say goodbye， our friendship will last forever．（　　）

A．forB．butC．orD．so

Remember to keep the dog on a leash （狗链） you walk it， honey!

Sure． I won't let it hurt others．（　　）

A．untilB．afterC．whileD．since

It's not a good for students to go online just for answers to homework．（　　）

A．skillB．gameC．hobbyD．habit