As _______volunteer at the Beijing Expo 2019 （园艺博览会），Lu Ming understands

_________idea of green life better than before．（　　）

A．a； anB．a； theC．the； anD．the； the

My mother has a poor _________of direction， so she is always afraid to go out alone．（　　）

A．sceneB．silenceC．serviceD．sense

After the terrible explosion（爆炸） in Xiangshui， Yancheng， many people from cities around came to hospitals to _________blood．（　　）

A．devoteB．createC．donateD．celebrate

You look pale today， Madam! What's the matter with you？

___________ serious． Just a cold．（　　）

A．SomethingB．AnythingC．NothingD．Everything

Ladies and Gentlemen， welcome to Beijing!! And if you need any help， please call me _________010﹣5558 6390．（　　）

A．atB．onC．withD．by