When you go outing with your sisters, you must see to ________ that they are safe.
| A．everything | B．it | C．them | D．yourself |
Most of the students haven’t finished their papers on time for __________reasons---one of which was that they carried out a week-long investigation in the countryside.
| A．previous | B．accurate |
| C．original | D．various |
The government is devoting resources to establish public health systems. _________ , the physical conditions of children have improved greatly.
| A．However | B．Meanwhile |
| C．Nevertheless | D．Otherwise |
The teacher finally _______ his project to the school board for approval.
| A．admitted | B．permitted |
| C．submitted | D．accused |
Looking for information on line today is very easy ; the _____________is how to tell whether the information you are getting is useful or not.
| A．challenge | B．ability |
| C．knowledge | D．competition |
It’s reported that global warming is heating the planet twice as quickly as _____ feared.
| A．extremely | B．preciously |
| C．previously | D．eventually |