The students ______ to write English words carefully from the beginning. 

It is essential that these application forms ______ back as early as possible.

— Why do we get up so early?— If we ______ the flight we would have to stay here for another day. 

The students have made a request that the reading-room ＿＿ open on Sunday afternoon.

—Is the letter from your mother?—Yes. But she ________ the letter herself, because she doesn't even know one word.