16. access/assess/ asset /excess
Citizens may have free to the library.
There is no to the street through that door.
The bank has of more than ￡1 billion.
The annual income of school teachers in this place was at＄900.
You'll have to pay charges on this luggage.
17. adapt/ adjust/ adopt
You should yourself to the new environment.
You can't see through the telescope until it is to your eyes.
The factories have the newest modern technology.
18. subject/ object/ reject
Many people to experimentation on animals.
Choose the good apples and the bad ones.
How many are you studying this semester?
19. extinct/ distinct/ instinct/distinctive
There is a improvement in your spoken English.
She has a very way of walking.
Dinosaurs have been for millions of years.
Birds learn to fly by
20. tend/ intend/ extend/ contend
Emma to take short rests every two hours.
My grandmother to go to bed early every day.
The firm is too small to against large international companies.
Can you your visit for a few days more?
China has greatly its influence in world affairs.
答案：
1. access, access, assets, assessed, excess
2. adapt, adjusted, adopted,
3. object, reject, subjects
4. distinct, distinctive, extinct, instinct
5. intends, tends, contend, extend, extended
