On feeling the earthquake，the teacher stayed calm in the front of the classroom，________ all the students to rush out of the classroom as quickly as possible.

A．urging

B．hoping

C．advising

D．encouraging

为庆祝十一国庆节，八年级（1）班同学要在广场上布置一个矩形的花坛，计划用“串红”摆成两条对角线，如果一条对角线用了38盆“串红”，那么还需从花房运来______盆“串红”；如果一条对角线用了49盆“串红”，那么还需从花房运来______盆“串红”．