用can,could,may,must,shall,should,will,would,can’t,mustn’t,needn’t 或have to 填空

用can,could,may,must,shall,should,will,would,can’t,mustn’t,needn’t 或have to 填空
1.There is air around us,thought we ________ see it.
2.Your mother is getting better and better.You _______ worry about her.3.You _______ play football in the busy street.
4.“_______ it be true .” “Yes.It _______ be true indeed.” 5.Tom _______ come to the party tonight,but I’m not sure.6._______ you please fetch me some water for me?7.Young trees ________ be planted in spring.8.“Must we hand in our exercise books today?” “Yes,you ______.” “No,you ________.”
9.“May I take this magazine out of the reading-room?” “Yes,you _______.” “No,you _______.”
10.Please speak a little louder so that I _______ hear you.