Can you tell me why you learn English so well— It’s very simple. ______ you study, _______ grades you will get.

Public attention at the moment is ______ on the problem of how to create opportunities for the laid-off workers

Recent efforts towards the greening of our cities have achieved much,although the results are still far from____.

The price of the car is too ________ for me. I can’t afford it.

It is these poisonous products ________ can cause the symptoms of the flu, such as headache and aching muscles.