Some children are in the playground．_______ are very happy.
| A．I | B．They | C．He | D．She |
He seems________.
| A．happily | B．happy |
| C．happiness | D．to happy |
It may take _________ years to make such robots ．
| A．hundred of | B．two hundreds |
| C．hundreds of | D．hundred |
There will be less ________．
| A．trees | B．people |
| C．pollution | D．cars |
I will be an engineer ____ ten years．
| A．after | B．in | C．at | D．on |
Last year I went to Beijing and ________ it.
| A．fell in love with | B．fell love with |
| C．fall love in | D．fell in love to |