One word in each sentence is incorrectly used.Pick it out an

One word in each sentence is incorrectly used.Pick it out and correct it.
 
1.        Sam has worked on the project in 2000.Almost four years have passed.
2.        Tom is 19,and when he is 90,he will have eating up 30,000 potatoes.
3.        Over the River Huangpu,several bridges have been building to connect both banks more easily.
4.        Clare should has slept or gone out,for the room is dark.
5.        -----Must Jean pay before she eats the food?
x05----- No,she mustn’t.
 
        Cloze
Passing exams always comes first for a student.For example,Clara can have a big celebration now,for she ___6___ passed all exams.All these days,she has ___7___ planning where to take holiday.But a few days ago,she ___8___ been studying day and night.Today she finds,through Internet,a discounted air ticket to Greece can ___9___ bought,so she books the ticket.There is no problem that she will ___10____ enjoying sunshine and delicious Greek food when her classmates struggle to prepare for the make-up exams.
 
 
        Translate the sentences in to English according to the requests.
 
12.到2011年的时候,上海已经举办好了世博会.（用将来完成时态）
13.一个花园正在河边建造.（用被动语态）
14.你可以,但是不应该借那么多钱.（用情态动词）