【2015·重庆】—Is Peter coming?
—No, he____ his mind after a phone call at the last minute.
| A．changes | B．changed | C．was changing | D．had changed |
The boy wanted to ride his bicycle in the street, but his mother told him___________.
| A．not to | B．not to do | C．not do it | D．do not to |
There is nothing wrong with using a credit card for purchases. It’s more _______ than carrying loads of cash.
| A．convenient | B．valuable | C．sensitive | D．innocent |
Cathy is taking notes of the grammatical rules in class at Sunshine School, where she ______ English for a year.
| A．studies | B．studied |
| C．is studying | D．has been studying |
Are you suggesting that I _____ too old for the job?
| A．am | B．should be | C．be | D．was |
—The state of illness is complicated．We need an experienced doctor．
—Whom would you like to have____?
| A．sent for | B．send for |
| C．to send for | D．been sent for |