enny, thank you for yourletter which ______ on April 1st

Some people disagree with the idea _____ digital textbook will improve education quality while the traditional textbook is out of date

This TV play can be very interesting, but can be enjoyable unless you like it.

Do you think you can pass the exam—______ It only took me half an hour to finish it.

I had wanted to help you last night but I couldn’t spare any time, for I ________ a composition which I have to hand in this morning