Was it _____ he was training in the field _____ he got hurt?
| A．that, when | B．where, that | C．that, where | D．when, that |
He is not _______ as a leader but he has gained _______ in teaching.
| A．success; many experiences | B．a success; much experience |
| C．great success; an experience | D．success; a lot of experience |
He was ______ medical student before he turned _______ engineer.
| A．a; an | B．the; the | C．a; / | D．/; an |
He’s so ill that his father has to send for _______ doctor.
| A．one | B．some | C．a | D．the |
Jumping out of _______ train running at a speed of 200 kilometers per hour is quite _____ dangerous practice.
| A．/; the | B．/; a | C．a; a | D．the; the |
________ your spirits. Try again and you’ll succeed.
| A．Catch up | B．Catch on | C．Keep up | D．Keep |