____ volcanoes now for many years, I am still amazed at their beauty as well as their potential to cause great damage.
| A．Studied | B．To study | C．Having studied | D．Studying |
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Sit down, Emma. You will only make yourself more tired, on
you feet.
| A．to keep | B．keeping | C．having kept | D．to have kept |
—Bob has gone to Califonia.
—Oh, can you tell me when he ?
| A．has left | B．left | C．is leaving | D．would leave |
The shocking news made me realizeterrible problems we would face.
| A．what | B．how | C．that | D．why |
Maybe if I sicence, and not literature then, I would be able to give you more help.
| A．studied | B．would study | C．had studied | D．was studying |
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