_____ I accept the gift or refuse it is none of your business.
| A．If | B．Whether | C．Even if | D．No matter when |
_____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B．As far as | C．If only | D．So long as |
In some countries, _____ is called “equality” doesn’t really mean equal rights for all people.
| A．which | B．what | C．that | D．one |
The mere fact _____ most people believe nuclear war would be madness doesn’t mean that it will not occur.
| A．what | B．which | C．that | D．why |
I don’t doubt _____ he is a brilliant scientist, but can he teach?
| A．whether | B．if | C．that | D．what |
Criticism and self-criticism is necessary _____ it helps us to correct our mistakes.
| A．by that | B．at that | C．on that | D．in that |