The first use of atomic weapons was in 1945, and their power ________ increased enormously ever since.
| A．is | B．was | C．has been | D．had been |
__________ has recently been done to provide more buses for the people, a shortage of public vehicle remains a serious problem.
| A．That | B．What |
| C．In spite of what | D．Though what |
Because Sarah has always saved __________, she is now able to afford a big house.
| A．what little she earns | B．how little she earns |
| C．for little she earns | D．with little she earns |
According to one theory, taking part in high-culture activities makes __________ easy for teenagers to make friends with powerful older people, __________ thus increases the chances of their lives turning out well.
| A．that, which | B．it, which |
| C．what, which | D．it, what |
There seems to be two causes as I try to figure out __________ that prevents so many children from being as happy as before.
| A．how it is | B．when it is |
| C．what it is | D．why it is |
We were struck by the limited use __________ their natural resources.
| A．those villagers made of |
| B．which those villagers made |
| C．for those villagers made of |
| D．for those villagers making of |