Only by practising a few hours every day ________ be able to play the piano well.

The pollution is getting worse and worse; we must stop pollution ______ a better life.

You do a very good job in German translation! –ThanksI ______ German in Zhejiang University for four years!

I couldn’t understand ______ at the poorchild.

It sounds like something is wrong with the car’s engine. ____, we’d better take it to the garageimmediately. [ ]