_____ to his work, the scientist didn’t get married all his life.
| A．Devoted | B．Devoting |
| C．Devote | D．To devote |
The flu is believed __________ by viruses that like to reproduce in the cells inside the human nose and throat.
| A．to be caused |
| B．to have caused |
| C．being caused |
| D．causing |
There were violent winds of 120 kilometers per hour or more in a hurricane，__________ huge waves, heavy rain and floods.
| A．causing |
| B．to cause |
| C．caused |
| D．having caused |
If city noises __________ from increasing, people __________ shout to be heard even at the dinner table in 20 years from now.
| A．are not kept; will have to |
| B．are not kept; have to |
| C．do not keep; will have to |
| D．do not keep; have to |
We have kept in __________ touch with each other for two years and he always gives me good advice on __________ phone.
| A．the; the |
| B．/；the |
| C．/；/ |
| D．the; / |
We can't __________ to wait any longer or we'll miss the plane.
| A．offer |
| B．avoid |
| C．afford |
| D．spare |