【单选题】
It is ____ to fly an airplane at three thousand miles an hour.
①
possible
②
likely
③
maybe
④
probable
【单选题】
A note has three essential components the addressee, the sender and [].
①
date
②
solution
③
message
④
complimentary close
【单选题】
Not until three years ago _____ to work outside.
①
he began
②
he begins
③
began he
④
did he begin
【单选题】
-- How long ______ you ______ the library book?-- For three days.
①
have; borrowed
②
have; kept
③
borrow
④
were; kept