◣词语大辨析◢-§(28) 
assure,ensure,guarantee,insure,warrant都含有一定的"保证"之意
assure 表示向某人保证某事一定会发生(内含有让某人放心之意) assure sb. of sth /assure sb. that...
ensure "确定,保证"确保某种行为一定会发生 ensure sth. /ensure that...
guarantee 对某事物的品质或人的行为"提出担保",对事物、商品等无质量,性能等方面的欺诈行为做出保证
insure "保险..."(纯粹经济意义)
warrant "担保,保证"
1.The director gave me his ____ that he would double my pay if I did my job well.
A.warrant B.certainly C.obligation D.assurance
2.The patient has been ____ of the safety of the operation.
A.assured B.guaranteed C.insured D.ensured
3.We must ____ that the telegram arrives in time.
A.secure B.assure C.ensure D.insure
4.We'd like to ____ our customers of the best possible service.
A.assure B.ensure C.guarantee D.insure
5.Tom has ____ his house against fire.
A.assured B.insured C.ensured D.guaranteed
6.Every camera we sell comes with a two-year ____.
A.guarantee B.safety C.confimation D.conservation
7.The manufacturers ____ that all the washing machines they supply are properly tested.
A.testify B.convince C.warrant D.manifest
8.My watch is ____ for one year.
A.assured B.insured C.guaranteed D.ensured
9.I ____ (you).
A.guarantee B.ensure C.warrant D.insure
10.His ability will ____ success to/for him.
A.insure B.ensure C.guarantee D.assure  1.The director gave me his __D__ that he would double my pay if I did my job well.上司向我保证,只要我工作出色,他将加倍付给我工资.
A.warrant B.certainly C.obligation D.assurance
2.The patient has been __A__ of the safety of the operation.病人已确信手术是安全的.(sb. be assured of sth.)
A.assured B.guaranteed C.insured D.ensured
3.We must __C__ that the telegram arrives in time.我们必须保证这份电报及时到达.(ensure that...)
A.secure(secure sth. from/against "使...安全,可靠") B.assure C.ensure D.insure
4.We'd like to __A__ our customers of the best possible service.我们愿向我们的顾客保证尽可能提供最好的服务.
A.assure B.ensure C.guarantee D.insure
5.Tom has __B__ his house against fire.Tom为他的房屋保了火险.
A.assured B.insured C.ensured D.guaranteed
6.Every camera we sell comes with a two-year __A__. 我们出售的照相机,每台都有一张为期两年的保修单.
A.guarantee B.safety C.confimation(证实) D.conservation(保存,保护)
7.The manufacturers __C__ that all the washing machines they supply are properly tested.生产商保证他们提供的所有洗衣机都经过了检验.
A.testify B.convince C.warrant D.manifest
8.My watch is __C__ for one year.我的表保用一年.
A.assured B.insured C.guaranteed D.ensured
9.I __C__ (you).我敢保证./我向你保证.
A.guarantee B.ensure C.warrant D.insure
10.His ability will __B__ success to/for him.他的能力会保证他成功.(ensure sth.)
A.insure B.ensure C.guarantee D.assure