1/ convenience

2/ polution

3/ difficulty

4/ contamination

5/ obligate( ko chắc)

6/ harmful

7/ 

8/ neccessary

9/ different

10/ moutainous

11/ 

12/ capable

13/ died

14/ contaminate

15/ 

16/ pollution

17/ natural

18/ poisonous

19/ traditional

20/ environmental

IV. Use the correct form of the verbs and the words in bracket.
1.
Having to wait for ten minutes was a minor ____incovenience ( sự bất tiện)____  .                        (convenient)
2.
What’s a ___pollutant ( chất thải) _____? It’s a substance that contaminates something.        (pollute)
3.
Astronomers are concerned about light because they have ___difficult_____ in viewing activities in the sky and out space. (difficult)   ( have difficult in doing st: gặp khó khăn trong vc gì)
4.
Water samples collected at these villages were seriously ____contaminated (adv+v)____ with bacterial. (contaminate)
5.
It is ___obligatory (adj/ bắt buộc) _____ for all people who join the festival to wear white clothes. (obligated)
6.
A number of cleaning products contain ____harmful (adj)____ chemicals.                          (harm)
7.
Most schools organise ____social ( xã hội)____ events for the students.                             (society)
8.
Some alterations to our original plans might be ___needed_____.                              (need)
9.
The programme was about customs in ____different____ parts of the country. (difference)
10.
Terraced rice fields in Sa Pa are slopes claimed for ___mountainous( adj)_____ cultivation in hilly or areas. (mountain)
11.
That fierce storm left behind badly ___damaged (adv+v) _____ buildings.                      (damage)
12.
Light pollution makes us ____unable ( ko thể/ ko có khả năng )____ to see the stars in the sky.                        (able)
13.
Many seabirds were ____died____ because of the oil spill.                                  (die)
14.
Waste from households will gradually ____contaminated____ the lake.         (contamination)
15.
Viet Nam is a country of tremendous ___diversity_____ with 54 ethnic groups. (diverse)
16.
Fish and many other animals are killed by ___being polluted_____ in their habitat. (pollute)
17.
___natural (adj) _____ habitats have been destroyed in recent years.                               (nature)
18.
Scientists say that exhaust fumes are ____poisoned____ our city.                       (poison)
19.
The dancers were wearing ____traditional ( adj)____ Hungarian costume.                           (tradition)
20.
Noise is considers as ____eviromental ( adj )____ pollution.                                              (environment)