─You look so tired, Celia! ─Yes. I volleyball the whole afternoon.

Can you work out the maths problem? —Sorry, I can ______ understand its meaning.

Can you give me a hand?—Sorry, I can’t help you do this because it is ______ my ability.[ ]

When are you going to Hainan?—I am going there ___ June 8, 2011.[ ]

Is this hospital ________ you once worked for 10 years?