It is _____ he often fails in exams _____ makes his parents worried about him.

e to my lecture. Hopefully, there are enough seats for each visitor to have .

Thedesksandseatscanbeusedforalongperiodoftime,they _____theheightofthechildren. [ ]

______ the books, he realized they were far from enough and told some of us to share.

Tom is in good health, because he often exercises and eats a lot of healthy .