请根据句意,用括号内所给词的适当形式填空。

1.My mother takes me to Da Tonghua Suppermarket_____(two)a month.

2.I have an e-friend____(call) David.

3.I broke your bike, I'm _____(real)sorry for it.

4.My favourite _____(play) are Yao Ming and Liu Xiang.

5.Who teaches_____(they)Maths this term?

原发性三叉神经痛治疗首选的方法（）。

A.卡马西平

B.B族维生素

C.封闭治疗

D.半月神经节射频电凝疗法

E.三叉神经微血管减压术