--- What’s the use of this kind of fuel(燃料) ?--- It can make the train __________ fast.
My sister is short, ______ I am tall.
—______ they have a new ruler? —No, they ______.
—What's this ______ English? —It's a book.
—What class in Jim in? —He is in ______.
The schoolbag is nice. But it isn't ______.