1.keep my eyes open
①Good food keeps you healthy.
②Please keep the boy quiet.
①She kept we waiting outside.
②He kept his eyes shut and stayed where he was.
③if your hands are cold，keep them in your pockets.
④The cold weather kept in doors.
2.be sure of/to do.
①He is sure of success=he is sure that he will succeed.
②He is sure to succeed=he will certainly succeed.
③I’m sure of the fact.
④.Be sure not to forget.
3.disagree with=not agree
①Even friends some times disagree.
②The reports from Rome disagree with those from Milan.
③The climate disagrees with me.
4.vary from culture to culture
The weather varies from very cold to quite mild.
②They have always lived from hand to mouth.
③She was trembling from head to foot.
5.There also differences as to how often…
As to：about concerning关于;至于
As to your brother，I’ll deal with him later.
eg：how much，how many，how old，how tall，how high，how long，how soon，how far，how often等等。
②一How long does the flight take?
一At least three hours.
③一How often do you so there?
——Twice a month.