Don’t worry! Philip is quite used to________in such busy streets as this.
| A．drive | B．be driving | C．have driven | D．driving |
_______caused the accident is still a complete mystery.
| A．What |
| B．That |
| C．How |
| D．Where |
________ we can’t get seems better than _______ we have.
| A．What; what |
| B．What; that |
| C．That; that |
| D．That; what |
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 |