There is a police car in front of the house of our neighbour's. _____ do you think _____ ？
| A．What；has happened | B．What；of happening |
| C．What；of being happened | D．Whatever；of happening |
It's dangerous to let the children who are _____ go swimming in the river.
| A．too young to | B．so young | C．not old enough to | D．so old |
_____ do you suppose he took to the park with him？
| A．Who | B．Why | C．When | D．That |
What he has learned through practice before _____ him a lot in his future work.
| A．helping | B．helped | C．it helps | D．will help |
He told us _____ she had done.
| A．that where | B．when all | C．all what | D．all which |