1．It is bad manners to________others while they are having a conversation.
A．disturb B．bother
C．interrupt D．drop in
2．We all can go out for a picnic this afternoon—________that the others agree.
A．to assume B．assumed
C．assume D．assuming
3．The new discovery of oil is of great________to the country’s economy.
A．signature B．significant
C．significance D．sign
