China has invested 15.2 billion yuan so far this year to support pig keepers, in a(n) _______ to ensure enough pig supplies.
Both___ _ and ____ _ laughter do harm to your health.
We ______certain livings as birds not because they have long legs or short legs,but because they all have feathers.
If no one ______ a coat with red buttons on it,I’ll have to keep it or send it to the Lost and Found.
The sports meet, originally due to be held last Friday, was finally _____ because of the bad weather.
—How about the book you are reading? —Good indeed. It ________many problems we have come across in our study.