It was not until I came here ________I realized this place was famous for not only its beauty but also its weather. (2012·湖南，30)

_____you have to do the job, you should try your best to do it well even though it may be very difficult for you

house in Shanghai cost much more than ours inour hometown, though not half______

So far the majority of clonedanimals have suffered from some different serious disorders, ______ died soonafter birth.

_____ it was very cold, _____ my friend still wentswimming this morning.