20．-It’s cloudy outside . Please take an umbrella .

　　 -　　　　 .

　　　 A．Yes , take it easy 　　　　　 B．Well, it just depends 　

　　　 C．Ok , just in case 　　　　　　 D．All right , you’re welcome

19．-If the traffic hadn’t been so heavy , I could have been back by 6 o’clock .

　　 -What a pity ! Tina　　　　 here to see you .

　　　 A．is 　　 B．was C．would be D．has been