_______ the smoke come out of the building, my first thought was to call the fire department as soon as possible.
| A．Having seen | B．When seeing | C．When I saw | D．Seeing |
I’m going to the library ______ the books.
| A．return | B．borrow | C．to return | D．to lend |
We went to town _________ some shopping.
| A．doing | B．did | C．to make | D．to do |
The funny story _______ me laugh.
| A．make | B．making | C．to make | D．made |
_____ with the accident, he was forced to resign.
| A．Concerned | B．Concerning |
| C．Having concerned | D．Be concerned |
They use computers to keep the traffic smoothly．
| A．being run | B．run | C．to run | D．Running |