86. In the following spring , the seeds should be knocked _______ the seed-heads and sown .
The manager and general engineer _____ very strict _____ his employees and ____ his work as well.
Nicolaus Copernicus’ discovery about the universe is ______, which ______later achievements in astronomy science.
We the Chinese are not to be ______, ________the situation is.
People should be cautious ______their personal information when surfing the Internet so as to prevent certain computer viruses ______ it.
The local police were______ by their authorities to _____ the situation as soon as possible.