--Julia said she sent yopu a birthday card yesterday .Have you got ?---- Oh , really ! I haven’t ________ my mailbox yet.
As far as I am concerned, a good plan must be ______ so that it can adapt to some necessary changes.
At the meeting, all the employees were required not to________ any important details before it was made public.
—Dad, I feel very nervous with the competition approaching. —________. It is an honor to take part in it.
If Peter ________ harder in the senior high school, he would be a college student now, too.
Nursery rhymes are attractive to children because they are easy ________ and sound funny.