单项选择题
A.Spending B.To spend C.Spend D.Spended
I regret（）that I'm unable to help you.A.sayingB.to sayC...
单项选择题I regret（）that I'm unable to help you.
A.saying B.to say C.say D.said
（）every day for 20 minutes.A.ExerciseB.To exerciseC.Sho...
单项选择题（）every day for 20 minutes.
A.Exercise B.To exercise C.Should exercise D.Exercising
I tried（）the book in a few days, but actually I couldn'...
单项选择题I tried（）the book in a few days, but actually I couldn't, just because of too much work for me.
A.finish B.finishing C.to have finished D.finished
