you eat the correct foods be able to keep fit and stay healthy.
| A．Only if ; will you | B．Only if ; you will | C．Unless; will you | D．Unless ; can you |
Guess what! I came across my primary school science teacher this morning, ______ I have lost touch for almost 20 years.
| A．of which | B．when | C．with whom | D．who |
After Tom had finished some paper work, he ______ interviewing the applicants.
| A．starts | B．had started | C．started | D．has started |
It takes ______ to talk to others on the team when that might expose some of your own weaknesses or ignorance.
| A．energy | B．patience | C．wisdom | D．courage |
______her ambition of becoming a professional singer, she has been training very hard since an early age.
| A．Realizing | B．To realize | C．Having realized | D．To have realized |
According to Darwin's Survival of the Fittest, only those species that were able to ______ the sudden great changes of their living conditions survived.
| A．appeal to | B．relate to | C．adapt to | D．contribute to |