据下列句子所给的汉语注释及句意，写出句子空缺处各单词的正确形式。

1．A crane is a bird with a long        (脖子)．

2．People all say Mao Zhedong is a good      (主席)．

3．Is there anything important in        (今天)newspaper．

4．will watch TV       (代替)of playing football．

5．Everything is hard at the very      (开始)．

6．Swallow flies to       (北方)countries in summer．

7．This is my      (报道)on how to look after animals．

8．I really don’t know what       (发生)to her yesterday．

9．Give me one more       (机会)，I will never make any mistake．

10．The boy       (迷失)his way and couldn’t find his mother．

根据句意，用括号内所给单词的适当形式填空。
【小题1】His father looked______ (angry)at his son. Because he often makes mistakes.
【小题2】Next Sunday will be my brother’s __________  ( nine ) birthday.
【小题3】The children are very happy. They can’t hide their_________(excite)
【小题4】_______ (luck), he found his lost pen just now.
【小题5】The swallow flies to_________ (north) countries in summer every year.
【小题6】Some people think learning English is________ (use).That’s wrong.

You are probably familiar with the saying：An apple a day keeps the doctor away. A recent research carried out by the Chinese University of Hong Kong may change the saying:
An apple a day may keep aging away.
The research chose fruit flies(果蝇), as they share many genes(基因)with humans. The fruit flies were either fed normally or had an apple extract(浓缩物) added to their diet.
It turned out that those fruit flies that were given apple extract lived about 55 days—five days longer than the flies that were normally fed. The research group also found it easier for the flies to walk，climb and move about as they aged.
According to the result, the researchers believed that the antioxidants(抗氧化剂) in the apple extract helped clean up dangerous chemicals(化学物质) that cause illnesses，as well as aging.
In another study，researchers examined diets of thousands of women. They discovered that those who regularly ate apples were 20 percent less likely to suffer heart illnesses and stroke.
The apples’ genetic code(遗传密码) was discovered recently. It allows scientists to develop nicer and healthier fruits. Researchers are already using the information to grow a kind of apples full of antioxidants that can keep eyes and joints healthy and protect humans against heart illnesses and cancer.
Apples that kill the desire(欲望) to eat could also be produced, with the first“extra-healthy’’apples on supermarket shelves within just four or five years.
The team that keeps studying apple DNA includes 100 scientists from five countries. Their research also suggests that around 65 million years ago, when dinosaurs began to die off the plant，which would finally become today’s apple tree, experienced a great genetic change. The number of many of its genes doubled. The extra genes allowed the apple to get used to worse conditions and go through a different development from peaches，strawberries and other related fruits.
【小题1】Why were fruit flies used for the research?

A．Apples produce chemicals that can change human genes.

B．Apples have antioxidants that kill chemicals that cause aging.

C．Apples are rich in vitamins that are needed in humans’bodies.

D．Apples produce chemicals that make apples taste more delicious.