This is a s_____ problem.We must solve it

This is a s_____ problem.We must solve it Whose book is this?It's_____.A.mine BWhose book is this? It's_____.A.mine B.heC.she This s_____ is from China. This is only a pro forma invoice.谁给我翻译一下? This is a cake in the s_____ of a heart填空 They can see a s_____ on the kite.Oh,this kite is Danny's! This math problem is s_____ for you,but it’s difficult for such a young boy this company has a good sale S_____ Don't tell others about this because it is a s_____ between us.Maybe people will be able to grow plants in space s_____. A s_____ is a kind of fruit. 用I,you,his,hre,it,this,me填空 1._____is a girl,_____name is mary.2.this is a pen,and what's_____?______is a pencil. she is a s_____ film star. Population is a bog s_____ problem What letter is a drink?It's_____. She is a very famous s_____. a good s_____ is half done she s_____ her present is a secret Hello!This is Tom s_____.谁能帮我补充一下