Only those who have experienced hardship ______ well aware of what happiness means.
| A．can they be | B．they can be |
| C．can be | D．they can |
Understanding the cultural habits of another nation, especially ____________ containing as many different subcultures as the United States, is very difficult.
| A．one | B．that | C．some | D．the one |
As we all know, apples are sold by ____ weight, and socks are sold by _______dozen.
| A．the; a | B．/; a | C．/; the | D．the; the |
Many difficulties have ______ as a result of the changeover to a new type of fuel.
| A．risen | B．arisen | C．raised | D．arose |
——Why are the tax collectors so busy?
——Many people prefer to have their tax forms completed by a professional rather than ___.
| A．do it themselves | B．doing it themselves |
| C．to do it themselves | D．done by themselves |
It was in the small house _______ was built with stone by his father _______ he spent his childhood.
| A．which , that | B．that , which | C．which , which | D．that ,where |