No matter how much time you spend planning a trip, things still _____ go wrong and air travel is no exception—from weather delays to lost luggage.
| A．deliberately | B．obviously | C．originally | D．occasionally |
. Don't you remember ___________ ?
| A．seeing the man before | B．to see the man before |
| C．saw the man before | D．to have seen the man before |
. People couldn't help ___________ the foolish emperor in the procession.
| A．laugh at | B．to laugh at | C．laughing at | D．laughing on |
. We’re looking forward ___________ the photo exhibition.
| A．to visiting | B．to visit | C．to having visited | D．visiting |
. The girl ___________ under that tree is my sister.
| A．sitting | B．sits | C．is sitting | D．sat |
. This sentence needs ___________ .
| A．a improvement | B．improve | C．improving | D．improved |