Columbus __________ America in 1492.
| A．discovered | B．looked for |
| C．invented | D．made |
Mary _____ six dollars for the pen.
| A．spent | B．paid | C．cost | D．took |
_____ you _____ to go to the park when they were children?
| A．Did, use | B．Did, used | C．Do, used | D．Do, use |
I don’t know _____ it next.
| A．how to do | B．what to do | C．what can I do | D．how can I do |
They enjoyed _____ piano.
| A．play | B．playing | C．playing the | D．to play a |
It’s very difficult to learn English well, but you can’t _____.
| A．put it up | B．take it up | C．look it up | D．give it up |