Mr Smith, please teach me how to draw on thecomputer today.- Oh, no._______. You have to get familiar with thekeyboard first.

If they 　　　　earlier than expected, they 　　　　here now.

2, Columbus and his crew arrived________ was so-called the New World by the westerners

nd girls, you should know what a great difference good mannersin public will ________ to a person.

He made another wonderful discovery, ______ of great importance to science.