一、单句语法填空
1.A blog is an online diary you can write what interests you.
答案:where
2.A search engine is a useful tool helps you find information.
答案:which/that
3.It’s difficult (say) how much time I spend online;it all depends.
答案:to say
4.Often she is too busy (chat) with her kids.
答案:to chat
5.Early (identify) of a disease can prevent death and illness.
答案:identification
