I don’t know the reason _______ you were absent from the meeting, and I am not sure whether someone will tell me the reason _______you haven’t told me.
American English has changed _______ the centuries. There are several reasons _____ this.
The little boy fell asleep while ______TV. So his mother sent him to bed at once.
---Look! The telephone is broken. Someone damaged it ________ purpose. ---That may be right. But perhaps it was broken _________ accident.
Recently our government policymakers are very ______ about the rapidly rising food cost.
Many people agree that______ knowledge of English is a must in______ international trade today.