Let’s _________ what we can do to save the animals in danger.
| A．look after | B．look for |
| C．find out | D．look at |
--- How can you _________ there? --- ___________air.
| A．get to; by | B．reach; by |
| C．get; in | D．arrive; on |
One of the most famous places of interest in China _________ the Palace Museum.
| A．be | B．is | C． am | D． are |
---__________ does it take to finish your homework? --- For an hour.
| A．How many | B．How much |
| C．How long | D．How soon |
He sometimes ___________ a train to work.
| A．by | B．take | C．takes | D．catch |