Water, which seems to be so simple and common, is ______ makes life possible.
| A．that | B．which | C．what | D．where |
Mr. Wang has two _____ sons； one has got married and the other has gone abroad.
| A．grow-up | B．growing-up |
| C．grown-up | D．grew-up |
The workers are pouring _____ steel into the model.
| A．melting | B．melted |
| C．melt | D．being melted |
The television is a _____ machine.
| A．newly-inventing | B．newly-invented |
| C．newly-invent | D．newly-invention |
Most of the people _____ to the party were famous scientists.
| A．invited | B．to invited |
| C．being invited | D．inviting |
I saw the boy _____ out a moment ago.
| A．run | B．runs |
| C．how to run | D．running |