E-mails, though _______ exposed to misleading information, are considered far more convenient than traditional letters.
—Why didn’t you give back Robert’s e-dictionary yesterday? —I forgot ______ it here, but I mean ______ it to him tomorrow.
Was it at the school ______ was named after a hero ______ he spent his childhood?
Our neighbor has ________ours.
______ everyone has completed the work, it is possible to come to a conclusion.
______ the danger from wars, people had to deal with a shortage of food, clothing, fuel and almost everything.