Nowadays more and more people are advised to arrange for insurance that they or their family members need medical treatment.
The time Dr. Wang has devoted _____ the disabled in the past five years is now considered_____of great value.
-----Are you sure that the party came to ______ power in ______1960s? -----Yes.
Once new difficulties _____ in our new job, we should learn to use our brains to solve them.
He has written a book_______I have forgotten.
This is the best chance for you to go abroad. Don't ________.