It was along the Mississippi River _______ Mark Twain spent much of his childhood.
| A．how | B．which | C．that | D．where |
His writing is so confusing that it’s difficult to make out ________ it is he is trying to express.
| A．that |
| B．how |
| C．who |
| D．what |
—Which one of these do you want?
—________. Either will do.
A.I don’t mind
B.I’m sure
C.No problem
B. Go ahead
Scientists study ________ human brains work to make computers.
| A．when |
| B．how |
| C．that |
| D．whether |
________ can be good at something for 40 years if he doesn’t love it.
| A．Anybody |
| B．Everybody |
| C．Nobody |
| D．Somebody |
Mrs Smith finds it hard to clear up the mess, as her children are always ________ whenever she tries to.
| A．in the way |
| B．on watch |
| C．in sight |
| D．on the line |