用所给词的正确形式填空。

1.________ (luck), our team tried our best but could never win the first prize.

2.The policeman told the boys________(not play)football near the road. .

3.Don't make the baby _________( cry ) again.

4.I am taller than him,and I am the ________(slim) of all the students.

5. If you eat too much_________ (health)food, you may be ill.

两种货币通过各自对第三国的汇率而算得的汇率，该第三国货币常常被叫做（）。

A.中心货币

B.关键货币

C.硬货币

D.软货币