用can,could,may,might,must,should,shall,will,would填空
1．—Is John coming by train?
\x05 —He should,but he ________ not.He likes driving his car.
\x052．Peter ________ come with us tonight,but he isn't sure yet.
\x053．Sorry I'm late.I ________ have turned off the alarm clock and gone back to sleep again.
\x054．That ________ not be Mary.She's in hospital.
\x055．I ________ have worked out the problem,but I was too nervous.
6．He ________ be here on time—he started early enough.
\x057．________ you do me a favor?
\x058．It has been announced that students ________ remain in their seats until all the papers have been collected.
\x059．You ________ have come to the conference yesterday.What was the reason for your absence?
\x0510．It ________ have rained last night for the road is quite muddy.