We should ________ advantage of all educational opportunities.

We should _________ （告知)you of the date of the delegation’s arrival．

______ the importance of English, we should put more effort into it and try to learn

Under no ______ should we seek temporary economic development at the expense of the enviro

______ these objections, we can not ignore the advantages of learning through the Internet

To prevent dental disease, we should take a range of______of Vitamin C per day.A．25-2,000

Those of us who smoke should have______ lungs X-rayed regularly since we are all aware of