It is worth considering what makes “convenience” foods so popular,and ________better ones of your own.
It is ten years since the scientist ______ on his life’s work of discovering the valuable chemical.
--Her father is very rich. --- ______ She wouldn’t accept his help even if it were offered.
Can you _____ your father in the old photo?
More than a dozen students in that school ____ abroad to study medicine last year.
I walked to the top of the hill with my friend, _____ we enjoyed a splendid view of the lake.