The police were seeking more information to find out ____ the rich film star.
| A．who was it that killed | B．who it was that killed |
| C．it was who killed | D．who was it killed |
Taking care of children calls for your time, abilities, patience and emotions. _____, it is not a simple thing.
| A．On the contrary | B．What's more |
| C．In conclusion | D．On the other hand |
All the members of the WTO should follow the ______ of trust and fair(公平) trade.
| A．instructions | B．principles | C．orders | D．rules |
In our class there are 46 students, ______ half wear glasses.
| A．in whom | B．in them | C．of whom | D．of them |
Tom took a taxi to the airport, only ______ his plane high up in the sky.
| A．to find | B．finding | C．being found | D．to have found |
New technologies have made ______ possible to turn out new products faster and at a lower cost.
| A．that | B．this | C．one | D．it |