(2014·福建名校质量检查)I hope the government will take more strict________against the smog that affected several big cities last winter.

(2013·成都第二次诊断)—Where did you get this book?—I picked it up from a second­hand bookshop if you ________  know.

Many of us love traveling, but lack of financial _________ often holds us back from seeing the world.

Apple sold ____ tablets ,the new ipad, in September alone as Samsung Galaxy series.

John couldn’t take part in the activity held at the cultural center yesterday for _____ reasons.