_________ you take an active part in physical activity ______ be able to keep fit and stay healthy.
| A．Only if; you will | B．Only if; will you |
| C．Unless; you will | D．Unless; will you |
If we work with a strong will, we can overcome any difficulty, ________ great it is.
| A．what | B．how | C．however | D．whatever |
Life is filled with things we have no control over, ________ ourselves, we can control.
| A．for | B．and | C．so | D．but |
I'll make some sandwiches, just ________ we get hungry later.
| A．even if | B．as though |
| C．if only | D．in case |
You know that some people say more but do less ________ others do the opposite.
| A．once | B．while | C．when | D．as |
The professor told me to start the research right now, ________ I was sure to fall behind.
| A．or | B．so | C．but | D．and |