He _counted___(数一数）how many books he had .
The white___ snow reminded me of the nice holiday.
You should take the chance___ to improve yourselves.
The jackets hanging over there are those students'____ .
She has practiced a lot and she is certain____ of winning the race .
The students are digging____ holes for trees.
You have made a contribution to donate___ software for computers .
Some food like burnt barbecued meat might cause____ cancer .
The glasses l had____ a moment ago are broken .