The old scientist devoted all her time she had ____ the western parts of China.

Can you help me ______ my English homework, Miss Zhang?-OK. Come to my house ______ Sunday morning.[ ]

_________ is the supermarket from your home? –Half an hour’s ride. [ ]

Can you understand what I mean? — Sorry, I can ______ follow you.

Try again, maybe you will come up with a better idea.