think 1-unit 7P1

It's a (a)  

Economic crisis is a _ problem. (really big)

(a)  

Eddison _ light bulb. ( 爱迪生—— 电灯泡）

(a)  

—news make you surprised and upset. （令人震惊的）

(a)  

My teacher asked me to r_ on the internet about my homework. （调查，研究）

(a)  

The man probably gets an eye_. (感染）

(a)  

People get trachoma because of _ water. ( 脏的）

(a)  

It's a (a)   . (数码摄像机）

I can see acnes on her _. (皮肤）

(a)  

The professor wrote down the _ on the blackboard. (公式）

(a)