1选择the great wall __ all over the worldA has known B was kno

1选择
the great wall __ all over the world
A has known B was known C is known D knows
2填空
vision phones__(see)now in some places.they__(not use)widely yet.
when they__(use)in homes sometime in the future,shopping__(do) through them.when people want to buy things,they just__(turn)on a vision phone and __(tell) the shop assistant what they__(want).in no time the things and their prices__(show) on the screen.if people __(decide)to buy them,they just place an order through the vision phone.then things__(send) to their homes and they __(pay) for the things through credit systems in the bank.
3改句子
Are the young trees often watered?(改主动语态）
4填空
in a way/rather than to/for ages
1your article is well written _______
2I decided to write___(to) telephone
3this kind of cups can only be used_____