_____ is a good form of exercise for both young and old.
| A．Walk | B．Walking |
| C．The walk | D．To walk |
The initial tunnels were just ___________ the surface of the ground. People were transported in carriages, which were ___________ the narrow tunnels by steam engines.
| A．under, broken through | B．below, put through |
| C．of , gone through | D．beneath, pulled through |
-Why ________ it rain at weekends?
-Never mind, let’s watch TV at home.
| A．can | B．would | C．shall | D．must |
___________ so delicious, the soup is very popular with the kids.
| A．Tasted | B．Tasting | C．To taste | D．Taste |
__________ these tips, and your time _______ doing research on the Internet _________ much worthwhile.
| A．Following, will spend, is | B．Followed, spent, was |
| C．Follow, spent, will be | D．To follow, spending, has been |
While doubts about the medicine’s safety have____________, interest continues to grow.
| A．dropped out | B．fell down | C．withdrew from | D．faded away |