He wants to know where the key( )success is.括号里填⒈个介词..

He wants to know where the key( )success is.括号里填⒈个介词..
The science museum ( ) at 8:00 on Sundays.
A opens B is opened C will open D opening 是选B伐?
The price of the laptop computer is( )
A cheap B C
这个The price of..后面形容贵是用expensive还是high捏?
( 那个..先告诉偶答案选什么..再告诉偶后面形容贵填什么..)
我出8起那价钱..(翻译)
I can't afford it( )that price..这里空填in还是at?
貌似那个price那题答案忘打了..
B是 expensive C high