He must have known the truth yesterday, _________?
| A．haven’t you | B．didn’t you | C．have you | D．did you |
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 |
Student loan is supposed to provide financial support for people who would _______ not be able to go to college．
| A．therefore | B．meanwhile | C．otherwise | D．nevertheless |
A new survey released by Yale University finds that Americans trust scientists most when ______ comes to information on climate change．
| A．that | B．it | C．this | D．there |
The massive earthquake and tsunamis has killed 350 people in a coastal town in Chile so far, _______ the total death number reported last Sunday．
| A．doubled | B．to double | C．doubling | D．having doubled |
In the USA, _______ Thanksgiving Day is a harvest festival．Traditionally, it is _______ time to give thanks for the harvest and express gratitude in general．
| A．the; a | B．/; the | C．/; a | D．the; the |