---- Would you mind if I opened the door?
--- ________.
| A．Yes, go ahead | B．No, go ahead | C．Yes, please | D．Never mind |
.A ________may be given ____means of flags, lights, and guns.
| A．sign; by | B．signal; in | C．signal; by | D．sign; in |
Seeing the man on the bike with a boy at the front and the other at the back, the policeman signed _______stop.
| A．to the man | B．to the man to |
| C．for the man for | D．to the man for |
Deaf people talk ________.
| A．with signs | B．with sign language | C．by signs | D．by speaking sign language |
A dark cloud is a _______of rain.
| A．sign | B．signing | C．mark | D．signature |
Since advertising can increase sales of production, _____it can _____the price.
| A．so; reduced | B．so; reduce | C．/; be reduced | D．/ ; reduce |