________ you stepped into the lab with your shoes on? You’re supposed to take them off before you enter it. I told you so!
If we ______ day before yesterday, we would have done the job.
You _____ me because I didn't say that.
Only by practising a few hours every day ________ be able to play the piano well.
Anyone can get into the club, _______ he is a member there.
If the building project_______ by the end of this month is delayed, the construction company will be fined.