1. The government had better _ (take) action _(prevent) air pollution.2. Binoculars can help you see _(clear).3. It takes hours _ (watch) the birds.taketo preventclearlyto watch用所給單詞的適當形式填空。用所給單詞的適當形式填空。4. Take a pair of sunglasses with you _(protect) your eyes.5. The gym is about 500 square metres in _(area).to protectarea1. Many _(visit) come to Yancheng Nature Reserve to go birdwatching every year.2. There are _(speak) in each corner of the hall.3. Yi Jianlian is my favourite basketball _(play).4. Einstein was one of the greatest _(science) in history.visitorsspeakersplayerscientistsWe can add -er, -or and -ist to some words (n./v.) to form nouns for people.Verb/Noun+ Suffix Nounspeak+ er speakervisit+ or visitortour+ ist touristSometimes we need to change the ending of the verb/ noun when we add the suffix.dance dancer win winnerpiano pianist science scientist表示人的身份、職業(yè)、國籍等的后綴 -er farmer speaker reporter dancer -or editor actor director sailor -ist artist scientist -an musician politician Asian Indian -ese Chinese Change the following words into nouns for people by adding the correct suffixes.1 act _ 6 play _2 art _ 7 report _3 drive _ 8 science _4 farm _ 9 work _5 paint _ 10 write _actorplayerartistreporterdriverscientistfarmerworkerpainterwriterAComplete the following sentences with the correct nouns of the words in brackets. Use the plural form if necessary.BBirds are _(sing). They can make beautiful sounds. Some _(act) can make different bird sounds. It is very interesting.A lot of _(tour) go to the wetlands to watch birds every year. There are many _ (visit) at bird shows too. Some _ (art) like to paint birds. singersactorstouristsvisitorsartistsThe birds in their pictures are really beautiful. Some _ (write) like to include birds in their poems too.Birds are part of out lives. They are our friends.writers1. make beautiful sounds 發(fā)出優(yōu)美的聲音發(fā)出優(yōu)美的聲音2. at bird shows 在鳥展上在鳥展上3. birds in the pictures 畫里的鳥畫里的鳥4. include birds in their poems 把鳥寫進他們的詩里把鳥寫進他們的詩里5. part of our lives 我們生活的一部分我們生活的一部分寫出下列單詞的名詞形式。寫出下列單詞的名詞形式。sing _ farm _invent _ climb_village _ wait _cut _ stop _piano _ train _singerfarmerinventorclimbervillagerwaiter/waitresscutterstopperpianisttrainerRevise how to form nouns for people by adding -er, -or and -ist.