Science and technology have in important ways __________ the improvement of agricultural production.
| A．contributed to | B．resulted from | C．carried off | D．handed over |
Jiaxing is such a beautiful city that it is well worth __________.
| A．visit |
| B．visiting |
| C．visited |
| D．to visit |
China recently tightened its waters controls near the Huangyan Island to prevent Chinese fishing boats from __________ in the South China Sea.
| A．attacking |
| B．having attacked |
| C．being attacked |
| D．having been attacked |
We've had a good start, but next, more work needs __________ to achieve the final success.
| A．being done |
| B．do |
| C．to be done |
| D．to do |
Passengers are permitted __________ only one piece of hand luggage onto the plane.
| A．to carry |
| B．carrying |
| C．to be carried |
| D．being carried |
Having finished her project, she was invited by the school __________ to the new students.
| A．speaking |
| B．having spoken |
| C．to speak |
| D．to have spoken |