There is a great deal of evidence that music activities engage different parts of the brain．
| A．indicate | B．indicating |
| C．to indicate | D．to be indicating |
Maria has to baby-sit. That’s______ she can't come with us.
| A．why | B．ho | C．when | D．what |
--- I rang you at about ten, but there was no reply.
--- Oh, that was probably ____ I was seeing the doctor.
| A．when | B．why | C．what | D．that |
15. _______ all the inventions have in common is _____they have succeeded.
A. What; what B. That; that C. What; that D That; what
This old computer must have been of great use to _______ did the scientific research.
| A．those | B．when | C．whoever | D．whomever |
--- Do you know _____ Mr. Black’s address is.
--- He may live at No. 18 or No. 19 of Bridge Street. I'm not sure of _____.
| A．what; which | B．where; which | C．where ; what | D．what; where |