I am very worried about tomorrow’s chemistry test.I’ m afraid I can’t pass this time.—!I’m sure you’ll make it.

_________useful advice it is ?

__________car traffic in city centers and make the air cleaner, some countries made rules that drivers should pay extra money if they drive in the city centers.

Every morning I try ________, but I’m still late at times.

How many girls are there in your class —______ them _____ over twenty.