1,Those foreigners look forward to visiting Beijing.
2,I am looking forward to receiving their presents.
3,be forgot to bring homework(按你给的句子翻译的 不过觉得你是不是打错了）
4,Don't forget to turn off the lights when you leave.
翻译句子：这些外国人盼望着来访问北京 我盼望着收到他们的礼物 被忘记把作业带来 离开时别忘了关灯