Though I haven’t seen Maria for ages, I could ____ her in the crowd at the station.

I have to ____my diet rather than eat the same all the time.，so that I can keep fit.

One day we will manage to ______ the world ______ this terrible disease—cancer.

Having become famous, Wang Baoqiang often has people ______ him in the street and ______ for his autograph (签名). 

In the future, care for the environment will become very important as earth’s natural resources _____．