新概念第一册第13课,Come upstairs and see it.能不能替换其中的see为look at,使整个句

新概念第一册第13课,Come upstairs and see it.能不能替换其中的see为look at,使整个句子为Come upstairs and look at it.
“我已经吃过午饭了?”用英语怎么说?I had lunch.还是I had have lunch.
"What's the matter?"
"We are ____."
A big
B tell
C heavy
D hot
答案为什么选D?
下面哪一个句子是正确的：
"What did you buy when you go shopping?"
"What did you buy when you went shopping?"
Here you are.和Here it is.有什么区别?
他们在街上走应该怎么翻译?
They are walking in the street?
They are walking along the street?
There is a fox on the tin.
整个上午或整个下午应该怎么说?all morning.还是all the morning.