为帮助大家在轻松愉快的氛围中掌握英语基础知识，本网站特提供以下资料，希望会带给你意想不到的收获：
1_____all our kindness to help her, Sara refused to listen.
A.At
B.In
C.For
D.On
2.____beforewe depart the day after tomorrow, we should have a wonderful dinner party.
A.Had they arrived
B.Would they arrive
C.Were they arriving
D.Were they to arrive
3. ____ conflict among city-states caused the eventual decline of Greek civilization.
A.Continuous
B.Continual
C.Constant
D.Contrary
4.____ he's already heard the news.
A.Chances are
B.Chance is
C.Opportunities are
D.Opportunity is
5.____ his knowledge and academic background, he is basically stupid.
A.But for
B.According to
C.For all
D.Thanks to