---I find the more we study, the more difficulty we have ________ out Maths problems.---Oh, I agree with you. Maths is more and more difficult.
--- It’s sunny today. Why ______ go out for a walk? --- ______. Let’s go now.
--- ______? --- He’s not very heavy and wears glasses.
--- How much is the ticket to Central Park? --- A one-way ticket ______ $40, and you can ______ another $20 for a round-trip.
The boat was made ______ steel and wood and it was made ______ my city.