—The patient looks much better.________ is it that has made him ________ he is today?—Perhaps the special medicine and his family's patient care.
Never _____ time come back again.
Can _____ be in the desk _____ you have put my letter?
Time should be made good use of ____ our lessons well.
---What do you think made the woman so upset? --- _____ weight.
The research is so designed that once ____ nothing can be done to change it.