用所给动词的适当形式填空。

1.Listen! How wonderfully the girls _________ (sing)!

2.Simon will leave here if he _________ (finish) the work tomorrow.

3.________ you ________ (go) to the World Park in Beijing next week?

4.—What did you do last night?

  —I _________ (write) a letter to my parents.

5.The zookeeper told them __________ (not leave) litter there.

患者男性，50岁，突发心悸2小时来院。入院后神志不清，血压测不出，查心电图示：宽大畸形QRS波群心动过速，QRS波振幅和波峰方向呈周期性改变，围绕等电位线扭转，诊断（）

A.室上性心动过速伴室内差异性传导

B.预激综合征伴心房颤动

C.阵发性室性心动过速

D.加速性室性自主心律

E.尖端扭转型室性心动过速