AthankingletterDearWangFang,Thankyousomuchforyourkindinvitationtospendthesummerholidayswithyou.Itwasverygoodofyoutoinviteme,butI`msorrytosaythatIshallnotbeabletogo.Iwilltellyouwhy.Firstofall,mymotherisseriouslyill.Andmyfatherisalwaysbusywithhiswork.Ishallhavetolookaftermymotheranddosomehousework.Thankyouagainforyourinvitation.YourssincerelyXiaoHong