4.To tell you the truth,even if I'm invited,I won't go to his birthday party.5.Don't ask other people to help you unless you really can't finish the work on your own.6.Sometimes a simple smile can be so powerful that it gives great courage to those in trouble.7.It remains to be seen whether this plan is practical enough to keep the project going on.8.There is no doubt that having a balanced diet and taking regular exercise are good for ourhealth.第7期A4版Key(One possible version):实战演练Dear Mr Brown,I'm very delighted to tell you that I won first prize in the English speech contest last Saturdayin my city.Now,I'd like to express my gratitude towards you.Previously,I avoided speaking English in class for fear of making mistakes,which made myoral English quite poor.However,thanks to your encouragement,support,and patient guidance,Isignificantly improved my English skills.Now,I can speak English fluently,and I am far moreinvolved than ever in language-related school activities.It's no exaggeration to say that without your help,I couldn't have wonthe top prize.I wish you all the best and hope you continue to inspire many more students like me.Yours sincerely,Li Hua