They waited and waited. _____ they had been looking forward to.

下列各句中，标点符号使用正确的一项是（ ）

30. the grand graduation ceremony ,which thousands of the graduates _____ last night, was more successful than we had expected.

The climate here is quite different from ______ of Shenyang.

The robots can do some heavy work , ____ they still can’t do many other things.