Children should make ______ a rule to wash hands before meals.
| A．one | B．that | C．it | D．this |
Even if the treatment ________, there is still no magic pill for the patients in the last stage of AIDs.
| A．works | B．uses | C．does | D．helps |
In that supermarket on sale is a new type of computer, _____ low price makes it attractive to the students from poor families.
| A．which | B．that | C．whose | D．what |
---Did you have any trouble with the western customs ?
---_________ to speak of.
| A．Nothing | B．Nobody | C．None | D．No one |
The boy promised ______late for school again.
| A．to not be | B．not to be | C．not being | D．being not |
______ interests me most in the world is the natural beauty of Guilin.
| A．That | B．Which | C．It | D．What |