【英语提问】这是3道选择题.

【英语提问】这是3道选择题.
1)a tall boy sits ___ me and i can't see the blackboard.
[in front of/behind/beside/below]
2)what time shall we have ___ lunch?
at 11:50 a.m. we will have ___ big lunch today.
[the;a/a;the/空;a/空;the]
3)look,there is a bird ___ the tree.
but i can only see some apples ___ the tree.
[on;over/in;in/in;above/in;on]