(届辽宁省大连市第三中学高三上学期期末考试英语试卷)The topic, _______ we devoted a heated discussion last night, is a hot issue at present.
I soon found that the work I was doing had already been done by someone else —__________ I was wasting time.
__________ with foreign countries can bring us much information about the world.
—Have you known Dr. Jackson for a long time? —Yes, since she________ the Chinese Society.
You may depend on __________ that they will be there on time.
The old custom __________ an old country in Europe.