.-----I heard that many westerners prefer vegetables to meat.
-----It is true. Americans eat ___ vegetables each person today as they did 20 years ago.
| A．more than twice | B．as twice as many | C．twice as many | D．that twice as many |
Teachers’ Day is a time to be________to all teachers who deserve special recognition.
| A．available | B．grateful |
| C．generous | D．ridiculous |
Air pollution is getting more and more serious，so we must take action________it is too late.
| A．before | B．after |
| C．until | D．when |
The footballer didn’t succeed in scoring，though________several chances by his teammates.
| A．was given | B．being given |
| C．giving | D．given |
You should study the details of the policy________before you sign it.
| A．in return | B．in advance |
| C．at ease | D．on purpose |
Jogging every morning is________good habit.Stick to it，and you’ll make________great progress.
| A．a；/ | B．a；a |
| C．the；a | D．/；/ |