单选题：I will _____if you can give me a hand in finishing the proje..

I think ________ important to get on well with my classmates.A. itB. there C. thisD. that

How many countries ________ the European Union made up of, do you know?A．isB．areC．haveD．has

I would appreciate________,to be frank,if goods could be delivered as soon as possible. [ ]A. youB. thisC. itD. myself

—Mr Johnson, what are teachers supposed to do for the students?—As teachers, we feel ________ our duty to teach our children to be good wherever we are.[ ]A. thisB. thatC. itD. there is

We have been told that Mr Li will come tonight, and________, our meeting will be held tonight.________, there won’t be any meeting until next week.A. if so; In caseB. if not; If soC. even though; If notD. if so; If not