27.Patients are advised to cut down on their consumption of alcohol.

28.( ) Paris tonight.Look -- here’s the plane ticket.

27.You ( ) smoke here.

26.( ) you don’t know the answer， ask me.

25.He is ( ) boy in our class.

24.Jim is ( ) Jack.

23.I can’t promise you ( ).

22.He ( ) be ill.He looks so pale.

21.I ( ) go to the party.

20.Hurry up，( ) we’ll be late.

19.The nights ( ) be cold.