. I still remember/will never forget the day ________ I first came to the college.
After the new equipment was introduced, they produced ______machines this year as the year before.
Can you make sure_______ the gold ring?
There’s only ten minutes to go. We can’t wait any more---- ______, we should start at once.
In the past ten years, the ________mountain climber _________ a lot from his own adventurous _______
To avoid on how to use the word, you’d better refer to a dictionary.