When something is on fire, people throw sand on it to put out the fire. The main use of the sand is to _________.

I have been skating _______ nine o’clock.

When was this car made It looks so old. —It was made _______1890.

Have you got any idea for the summer vacation?—-I don’t mind where we go________ there’s sun, sea and beach

d I could hardly work together,_____