—Nowadays a growing number of people go to work by bike.
—Bicycling is good exercise；________it doesn't pollute the air.
| A．therefore | B．moreover | C．however | D．otherwise |
—Beijing experienced _____ heaviest snowfall in ____ month of January .
| A．\ ; a | B．a ; the |
| C．the ; the | D． the ; a |
We already have ______pencils, but we need two ____ pens.
| A．dozen of ; dozen | B．dozens of ; dozens |
| C．dozens of ; dozen | D．dozen; dozen |
Why are you leaving right now? You promised to stay ____ hours.
| A．both two | B．more two |
| C．two another | D．another two |
We asked John and Jerry, but ____ of them could offer a satisfactory explanation.
| A．either | B．none | C．both | D．neither |
This book______18 articles , _______ three written by my father.
| A．contains; includes | B．includes; contains |
| C．contains; including | D．includes; containing |