单项选择题
A.went B.had gone C.has gone D.goes
Many people watched the boys（）the mountain at that time...
单项选择题Many people watched the boys（）the mountain at that time.
A.climb B.climbing C.to climb D.climbed
Many countries are increasing their use of natural gas,...
单项选择题Many countries are increasing their use of natural gas, wind and other forms of （）
A.energy B.source C.power D.material
Madam, do all the buses go downtown?（）A.Wow, you got th...
单项选择题Madam, do all the buses go downtown?（）
A.Wow, you got the idea. B.No, never mind. C.Pretty well, I guess. D.Sorry, I'm new here
