After two years’ study, he now has a __________ better command of English

In the center of the lake are two islands, one of which is ______, if not larger than, the other.[ ]

Mrs. Green takes the _______that children should be allowed to learn at their own speed.

What a lot of fun it is to play on a frozen sports field! — Isn’t it rather risky, ?

选出下列各项中加点的字解释有误的一项（ ）