Until the start of the Industrial Revolution, mankind was poor, hungry, and constantly at the _______ of disease and natural disasters．
| A．power | B．limit | C．control | D．mercy |
Last night's TV news said that by then the death of the missing people __________ yet.
| A．had not been proved | B．had not proved |
| C．have not been proved | D．have not proved |
Tom took a taxi to the airport, only __________ his plane high up in the sky.
| A．finding | B．to find |
| C．being found | D．to have found |
He got up late and hurried to his office，__________ the breakfast untouched.
| A．left | B．to leave |
| C．leaving | D．having left |
Nowhere else __________ be able to find a larger display of sea animals, including one of the largest collections of sharks in the world.
| A．you will | B．can you |
| C．could you | D．will you |
To reach your goal（目标），you should make a good plan and __________ make good use of your time.
| A．in all | B．above all |
| C．after all | D．at all |