Over the years, people have learned from ants that teamwork and perseverance are indeed two key ______ to success.
| A．certificates | B．ingredients |
| C．approaches | D．instructions |
The doctor has ________a new idea on the treatment，which is well thought of by his companions.
A come about B．put forward C．spoken up D．regarded as
The ________look on his face showed that he hadn’t expected it.
| A．astonished | B．astonishing | C．being astonished | D．having astonished |
The doctor suggested he ________with a serious disease and that he ________to hospital at once.
| A．be infected；be sent | B．was infected；be sent |
| C．should be infected；was sent | D．be infected；was sent |
________I met him，he was working as a secretary in a big company.
| A．Since the first time | B．The first time |
| C．For the first time | D．The first time which |
Only when he told me ________what trouble he was in.
| A．did I realize | B．I realized | C．do I realize | D．I realize |