根据首字母提示填空。

1. Walk on u________ you reach the end.

2. He is friendly to me. He looks l________ my brother.

3. Tom dislikes black, I h________ it, either.

4. The box is too heavy. The little boy can't c________ it.

5. I am going on a holiday with a o________ of my friends.

术中的无菌原则，下列哪些是正确的（）

A.术者前臂一旦触及有菌物后，应立即更换无菌手套

B.无菌巾湿透时，应加盖无菌单

C.手术台边缘以下的布单认为是无菌地带，接触后不必更换无菌手套

D.不应超过术者头部或背后传递器械及手术用品

E.同侧人员掉换位置时，应先退一步，背对背地转身调换，以防污染