_____ three influenza type A virus subtypes(子类型) have been found in pigs.
A computer costs about ______ of a typewriter.
---When did you arrive here?---Just ______when you left.
The first day of ______ year is called ______New Year’s Day. A. the; / B a; / C. the; a D. the; the
This pen doesn't look like ______. ______pen has been lent to Xiao Wang. I think it must be______.
If you often______ yourself, or in other words, ______ your strengths, you are likely to have______ self-esteem.