根据句意及首字母提示或所给汉语意思写出所缺单词。
We decided to do the ____________ (实验) in the evening.
Please give me a c ____________ answer .
The mountains form a _______________(背景) to this photograph of the family.
Our team beat the other in the football m__________.
What the headmaster said at the meeting has a great ___________(影响).