1. Was it in October, 2010, if I may ask, ______ the new Shanghai-Hangzhou Express Railway was put into use?
A. which B. when C. that D. How
2. Experts think we won’t have clean water to drink unless something_______ soon, but much remains_______ about environment protection.
A. would be done; doing B. is done; to be done
C. will be done; to do D. is done; to do
3. Susan was expecting her favorite singers, but to her disappointment, ______ appeared.
A. some B. none C. everyone D. no one
