Whatever work you are doing, you should concentrate your attention ______it.
| A．to | B．towards | C．with | D．on |
I'm pleased to see the problem _____ so quickly.
| A．settled | B．having been settled | C．be settled | D．settle |
What he said made us deeply _____.
| A．move | B．moved | C．moving | D．being moved |
I saw him _____ behind the tree, thinking.
| A．sat | B．seated | C．seating | D．seat |
Maria would not go to the party, as she had no fine dress, no jewelry _____.
| A．to show | B．shown | C．showing off | D．to show off |
Would you like Helen _____ you since you have some difficulties?
| A．helping | B．to help | C．has helped | D．help |