如图所示，电源电压不变．在滑动变阻器的滑片P移动的过程中，电压表的示数变化范围是0～5V，电流表示数相应的变化范围是1.5A～1.0A．．则：R₁的阻值是______Ω；电池的电压是______V．

用所给单词的适当形式填空：(10分)

1．It’s important to send my best __________(greet) to all your family.

2．The fans became very excited to get those _________(hero ) telephone numbers.  

3．We didn’t go to the meeting because it was ________(important).

4．________(luck), his cousin didn’t hurt his legs in the traffic accident.

5．I thanked our teacher for agreeing ___________ (let) me go on the trip last month.

6．When the player was a child, his mother spent much time________(sew) the clothes for him.

7．In the dinner party, the children helped___________(they) to much delicious food happily.

8．During this year’s Reading Week, Kitty read one of___________(famous) books in the world.

9．Julie was very happy to receive a lot of beautiful presents on her_________(twelve)birthday.

10．The writer was born in Inner Mongolia. He often _______(ride) a horse when he was young.