Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.
| A．as | B．that | C．which | D．where |
After designing more experiments,they were able to clarify the procedure bees communicate information that they use to find and fetch food.
| A．by which | B．in which |
| C．by that | D．for which |
It was also apparent that the wagging dance, the bee moved sideways,sent another message.
| A．which | B．where | C．that | D．what |
All the bees had been at nearby feeding place were doing the circling dance.
| A．which | B．what | C．that | D．how |
All the students were studying in class Tom;he was playing football on the playground.
| A．except | B．besides |
| C．except for | D．except on |
The doctor wrote him a prescription some medicine.
| A．to | B．in | C．on | D．for |