think 1-unit 7P1

It's a ___

Economic crisis is a _ problem. (really big)

Eddison _ light bulb. ( 爱迪生—— 电灯泡）

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

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

The man probably gets an eye_. (感染）

People get trachoma because of _ water. ( 脏的）

It's a __. (数码摄像机）

I can see acnes on her _. (皮肤）

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