用方框中所给动词的适当形式完成下列句子。

I ____my teeth three times yesterday.
When I was a child, I ____ to be a doctor.
We ____ our vacation last year. We stayed at a very nice hotel.
Amy's grandfather____ when he was 90 years old.
The concert ____ at 7:30 and ended at 10:00.

将17.9 g Al、Fe、Cu组成的合金溶于足量的NaOH溶液中，产生气体3.36 L（标准状况）。另取等质量的合金溶于过量的稀硝酸中，生成6.72 L NO（标准状况），向反应后的溶液中加入过量的NaOH溶液，得到沉淀的质量：（）

将图片与句子匹配。

⑴ ____

⑵ ____

⑶ ____

⑷ ____

⑸ ____

a.Look at my new cap.

b.Look at my skirt.

c.Look at my T-shirt.

d.Hello, I'm Liu Tao.

e.Look at my jacket.

f.Look at me.

    The Internet plays ____ important part in our daily life. But some people spend too much time online. This is a new disease. Doctors call it Internet Addiction Disorder (互联网成瘾症)(IAD). People with IAD spend hours ____ (talk) online or playing computer games. Many people with IAD spend ____ (much) time on the Internet than with family or friends. Some people with IAD even give up ____ (they) jobs! Do you have IAD? Think about the following ____ (question): How long are you online a day? Is it a lot or a little? Do you get angry ____ (easy) when you can't play a game? Nowadays, millions of people have IAD in the world. Doctors give people some advice. First, ask yourself "How long should I ____ (be) online today?" Then try your best ____ (take) a break. What's more, you can use the computer or play games ____ (two) a week, not every day. ____ this way, you can have a good life with other friends.