__________people relaxation and pleasure, but it can also increase their knowledge of any kind.
| A．Not only can travel give | B．Not only can give travel |
| C．Not only travel can give | D．Not only travel gives |
Part of the reason Charles Dickens loved his own novel，David Copperfield，was ________ it was rather closely modeled on his own life.(2010·北京)
| A．what | B．that | C．why | D．whether |
I'm afraid he's more of a talker than a doer，which is ________ he never finishes anything.(2011·山东)
| A．that | B．when | C．where | D．why |
I'd like to start my own business—that's ________ I'd do if I had the money.(2011·江西)
| A．why | B．when | C．which | D．what |
Scientists study ________ human brains work to make computers.
| A．when | B．how | C．that | D．whether |
We promise ________ attends the party a chance to have a photo taken with the movie star.
| A．who | B．whom | C．whoever | D．whomever |