Every year, _____ energy is spent on environment protection.
| A．large quantities of | B．a good many |
| C．a great deal of | D．a plenty of |
He is so stubborn that once he makes up his mind , nothing can change it;_______, it’s no use arguing with him.
| A．therefore | B．however | C．besides | D．so |
____________Li Bai, a great Chinese poet, was born is known to the public, but some won’t accept it.
| A．That | B．Where | C．What | D．Which |
The park was full of people_________ themselves in the sunshine.
| A．having enjoyed | B．enjoying |
| C．enjoyed | D．to enjoy |
What is known to all is that up to now China has made a great___________ to preserving the peace.
| A．conclusion | B．comment |
| C．campaign | D．contribution |
---Did you remember to take the key to Tom?
---Yes, I gave it to him ________ I saw him.
| A．while | B．once | C．suddenly | D．the first time |