He is still regretting______to the lecture made by Professor Wang.A．not goingB．not to goC．

Although he has become rich, he is still very ______ of his money.[2001]A．economicB．thrift

He soon regretted his______decision to get married.A．promptB．quickC．instantD．hasty

Old______he is, he still studies English every day.A．asB．althoughC．ifD．like

______it is long after dark, he is still wearing black sunglasses.A．IfB．AlthoughC．UnlessD．

He now regrets______harder when he was at school.A．not to studyB．not studyingC．having not

______, the professor is still trying to learn a new language.A．However he is oldB．Old as