??1.Mr.Mike is instructing the listeners，but none ____ (be)listening.
??2.The committee ____ (have)been arguing about the financial problems among??themselves for many hours.
??3.Our football team ____ (have)won the championship.
??4.Our football team ____ (be)quarreling over their different positions.
??5.Cowboy pants ____ (be)popular last year.
??6.A loss of wealth，a loss of health，a loss of friends， ____ (seem)to be a??serious problem.
??7.To make life worth living ____ (sound)nice.
??8.One or perhaps more plays ____ (have)been written by the playwright.
??9.The president of the college，along with some other faculty members， ____ (be)? planning a conference.
??10."Keeping cool"is the first of the rules that ____ (be)to be remembered in an? accident.
??11.Neither he nor I ____?going to attend the party tomorrow.
??12.None ____ (be)so sure of his knowledge as one who ____ (have)only a little learning.
??Key：1.are??2.have 3.has 4.are? 5.were?6.seems
?? 7.sounds 8.have 9.is?10.are?11.am? 12.is，has
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