The ______ you study, the ______ grades you will get.

You’d better keep us ______of any change of the address as soon as possible [ ]

How did you find him out?—I ______ his name by chance on the list.

It is usually warm in my hometown in March, but it _____ be rather cold sometimes.

We have all become addicted to(对…上瘾) sugar, particularly in soft drinks. Today, sugar consumption is ______ it used to be.