s suggest that parents should let their child do tasks that he is physically and mentally capable of doing by himself, ______ will help to build a self-confident kid.

toys are notsuitable for children four yearsold, who are too young

Mike’s the equal of his sister ____ intelligence is concerned, but he doesn’t work hard at all.[ ]

Mr. Black often goes to work by______ bus.

___ most of the earth’s surface is covered by water, fresh water is very rare and precious