please ______ your exam papers once again before handing them in.
| A．going over | B．went over |
| C．go over | D．to go over |
______ important it is for kids to imagine freely !
| A．what | B．what a | C．what an | D．how |
–Mum, ______ I visit the Movie Museum tomorrow?
--I’m afraid you can’t . It is closed on Monday .
| A．must | B．may | C．should | D．need |
Martin was so busy ______ the old that he gave up his part-time job.
| A．helping | B．helped | C．to help | D．help |
My friend invited me ______ the art club , and I accepted it with pleasure.
| A．join | B．to join | C．joined | D．joining |