—I have just received another message, telling me I have won a big prize. —Don't jump on it. You ________.
After losing contact for twenty years, they met again _________ in a party.
Nobody knows how the accident _________.The police are investigating it.
I tried to telephone Mary last night, but I couldn’t ________ after trying again and again.
History is the best teacher.It _________ records the development of every period, whether it is good or not.
The decision to inspect the middle school is _______ so that they can see the true situation of both teachers and students.