31.
（a） they won't be able to sit together.
（b） she could only get one ticket.
（c） the performance starts at eight.
（d） they'll be going on different days.
32.
（a） it's made from an old recipe.
（b） it's in the refrigerator.
（c） it has a variety of ingredients.来源：www.examda.com
（d） it needs to be heated up.
33.
（a） he thought dr. jeffries would get the job.
（b） he's not sure dr. jeffries will be a good chairperson.
（c） he doesn't know dr. jeffries very well.
（d） he thought it took too long to make the decision.
34.
（a） when carolyn left.
（b） where carolyn went.
（c） what time carolyn will return.
（d） how many places carolyn visited.
35.
（a） he can't find the meeting either.
（b） he has changed his mind about attending the meeting.
（c） the meeting was in room 110 the year before.
（d） the meeting is likely to be well attended.
36.
（a） speed limits are the same in all areas.
（b） she'd told him what it was.
（c） there are signs along the road .
（d） he has recently received his driver's license.
37.
（a） he was on his way to work.
（b） he hadn't realized he was speeding.
（c） he lives on elm street.
（d） his speedometer isn't working.
38.
（a） she took away the man's license.
（b） she gave the man a speeding ticket.
（c） she gave the man a warning.
（d） she asked the man to become more familiar with the area.
39.
（a） to explain why recycling is important.
（b） to describe the recycling program.
（c） to discuss whether or not recycling should be mandatory.
（d） to explain how to find the recycling facilities.
40.
（a） because all the trash cans are the same color.
（b） because not enough people volunteer to collect the trash.
（c） because most people don't like to sort their trash.
（d） because collections are not made on a regular basis.
