It ____ that making a plan is easier thancarrying it out.

Why are the students working so hard these days? — _____ ready for the coming entrance examination. [ ]

Why, David, you look so tired! –Well, I ______ a report for the whole day and I must finish it tomorrow

Great efforts to increase agricultural production must be made if food shortage _____ avoided

Did you find the notebook ______ Jim hadgiven me for my birthday