1．I don’t know who invented _______ telephone, it’s really _______ most useful invention.
A. the; a B. the; the C. a; a D. 不填；不填
2．Though ________ of danger, he still went skating on the thin ice．
A．warned B．to be warned C．being warned D．had been warned
3．It is the test system, _____ the teachers, that is to blame for the heavy burden of middle school students nowadays.
A. other than B. or rather C. rather than D. more than
