The following chapters provide step-by-step instructions for practical _______ of genetic (基因)engineering to agriculture.
.______ Yancheng today is more beautiful now. Mr.Jackson said he would visit it ______ fourth time.
Either you or Igood at drawing?
______ either you or I good at drawing?
To get into the habit of smoking means _______ one’s own life short.
_______ came that our team won.