The Great wall is the only one of the buildings on the earth_____ seen from the moon.
| A．which is | B．which are | C．that are | D．that is |
By 2013, cases of AIDS had been reported in Harbin, thus _____ AIDS a provincial concern.
| A．to make | B．making | C．having | D．made |
I was blessed with a happy childhood, ______ that most people would want to have.
| A．the one | B．one | C．it | D．/ |
The Arctic, which is abundant in oil, _____ second only to the Middle East, is ______ home to seals.
| A．the; a | B．/; the | C．the; a | D．/; / |
There are roughly 1, 000 students in Grade Two, most of _____ are girls.
| A．which | B．them | C．whose | D．whom |
Rubbish in space has caused collisions, which would ______ produce more rubbish that threatens astronauts and satellites.
| A．in return | B．in turn | C．in particular | D．in detail |