用所给动词的正确形式填空。
①My parents want me____ (stay) at home every night because it’s dangerous ou tside.
②—You look so sad today.     —I____ (argue) with my girlfriend last night.
③Lucy, what should I do? I need some money ____  (buy) some presents for my best friend.
④—I found it difficult ____ (get) to sleep in the night.
—You’d better____  (take) some sleeping pills.
⑤Lily is 1.7 meters tall. She is tall enough ____  (reach) the apples on the tree.
⑥Don’t ____ (compare) others with yourself, just ____  (work) hard.
⑦She has to____ (go) to see the doctor.

Don't arrive late ________ class.

已知a+1，2a﹣4是同一个数的平方根，求这个数．

不同的职业有不同的服饰，医生的衣服一般是____色。

某同学做“伏安法测量小灯泡电阻”的实验：正确连接电路后闭合开关，调节滑动变阻器使电压表的示数为图1（甲）所示，此时电流表的示数如图1（乙）所示，问：

（1）如图1（乙）电流表的读数为____ A=____ mA．

（2）如图1（甲）电压表的读数为____ ，小灯泡的电阻是____ Ω．

（3）在物理实验中经常用到电阻箱，如图2所示的电阻箱的阻值为____ 欧姆，该电阻箱的变阻范围是____ 欧姆．