Who helped Betty tidy up the bedroom just now—_________. She cleaned it all by herself.

You are late. The meeting __________for about ten minutes.

1—Why haven’t you askedher to come here—She _______ an important experiment when Ifound her and she _____ it.

It was not until dark _____ he found _____ he thoughtwas the correct way to solve the problem．

The computer is broken. ＿＿＿ it＿＿＿ today?