The old couple are now quite ______ as their son is out of danger.
| A．with ease |
| B．at ease |
| C．at stake |
| D．at last |
______ that he was in great danger, Eric walked deeper into the forest.
| A．Not realized |
| B．Not to realize |
| C．Not realizing |
| D．Not to have realized |
______ in the fields on a March afternoon, he could feel the warmth of spring.
| A．To walk |
| B．Walking |
| C．Walked |
| D．Having walked |
______ different kinds of pianos, the factory is sure they can satisfy people’s need.
| A．To produce |
| B．Being produce |
| C．Produced |
| D．Having produced |
______, most teenagers now listen to rock music. However, John likes classical music better.
| A．In a word |
| B．In general |
| C．In time |
| D．In total |