单词拼写。
Tom and Jack had ___________________( 通信 ) for many years.
Professor Smith , an ear ____________(专家 ), organized a national survey of nose  disease in children.
Singing, playing games, and reading are forms of _____________(消遣)
The chairman is considering changes to the sex ________________(歧视)　law to promote equal opportunities.
A p_______ gives the owner their right to be the only one who can make , use or sell an invention or product for a particular number of years.
Everyone was encouraged to d________ a day’s pay to help survivors of the disaster.
Had not Tom dived into the river to r___________ him, the boy would have drowned.
A car is very h______ for people who live some little distance from town.
Some good sources of information can a_______ us in making the best selection.
his medicine is ____________( 有毒的)　if taken in large quantities.