Long years of hard work made _____ possible for him to enter a key university in Beijing.

______side of the street is lied with different shops, ______of which sell electronic products.

. I'd really appreciate ________ if you would turn off the lights before you leave.

They told us that these small apples are often sweeter than big ____.

The reform of the Family Plan and the outcome_____ will cause will have a great influence on young couples．