已知某生产厂家的年利润y（单位：万元）与年产量x（单位：万件）的函数关系式为 ，则使该生产厂家获得最大年利润的年产量为( )
Remember to use sunglasses to stop the sun from ________ directly in your eyes.
shine
shining
to shine
Everyone knows now that plastic pollution is ________ huge problem for the environment.
a
an
/
We'll have a class meeting ________ 3：30 this afternoon.
in
on
at
-I'd like to thank you for your invitation to Heze Peony Garden.
﹣﹣ .
With pleasure
It's my pleasure
For pleasure
―Could you please show me _______________？
-Sure；First of all you'd better make sure you've got everything you need.
how can I make a Chinese lantern
how I can make a Chinese lantern
how could I make a Chinese lantern
，则使该生产厂家获得最大年利润的年产量为( )，则使该生产厂家获得最大年利润的年产量为( )
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