请教您归纳的易错题目,请您做出具体解析,以便不会再错,
The Lis ________a birthday party for Grandma's hundredth birthday next eek
A   have      B  were   having     C  are  going to   have     D had
 
2.The little boy _____out alone()before ,so his mother  is  worried about him.
A   didn't go    B  hasn't  gone      C won't  go      D  doesn't go
 
3.----Do you know how to look after a puppy?
--yes ,the officer  _______me a booklet about how to feed it.
A  gives    B  was  giving     C  has given     D will  give
 
4.Many  of my classmates want to be travel _________(agent)in the future