So hard ______ that we had to wait another day.

Emergency line operators must always _____ calm and make sure that they get all the information they needto send help.[ ]

You could see the runners very well from _________ we stood.

ing to the new rules, if a student________ happen to damage something in the campus, he/she should report it to those concerned immediately.

________ it rain tomorrow, we would have to put off the sports meeting.