—This problem is too difficult. Can you show me _______, George?
—Sure.
| A．what to work out | B．to work it out |
| C．how to work it out | D．to work out it |
By the first day of August, 2007, the PLA has its ______ birthday.
| A．eighty | B．the eightieth | C．eightieth | D．eighties |
—Our Chinese diving team won a gold medal again!
—What _____ good news!
| A．a | B．an | C．the | D．/ |
The restaurant is so popular here. Look, there are so many _____ here.
| A．food | B．dish | C．people | D．waiter |
The Sydney Opera House is like a huge sailing boat with water ____ three sides.
| A．at | B．of | C．in | D．on |
In hot summer, we should pay attention to protecting ourselves _____ strong sunlight.
| A．from | B．for | C．with | D．to |