單項(xiàng)選擇題This maths problem is easy（）

A.work out 
B.to be working out
C.worked
D.to work out


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A.to
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A.who
B.whom
C.whose  
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A.Oh, I have never seen you. 
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C.Hello, John. Nice to meet you.
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5.單項(xiàng)選擇題This box is too heavy for me to carry it upstairs.（）

A.You may ask for help. 
B.I'll give you a hand. 
C.Please do me a favor. 
D.I'd come to help.