Giúp e câu c bài 4 với ạ

1.when it was first brought to europe ,the tomato was thought to be poisonous.

2.before paul returned to his country ,his american friends gave hi a surprising going-away party

3.when money is put in a bank it is kept safe 

4.because the little boy believed that no one loved him he ran away from home

verb form 

1.i really appreciate your (train) hard last month 

2.the runner-up was not so pleased with his (win) the silver medal

3.the athlete denied (take) the banned drugs before (be) called to the team

4.she shouldn't have too much regretted (lose) the english-speaking contest last week -she was not fluent enough anyway

5.we are very greatful for your (make) all necessary arrangements for our visit and now (come) to see us off

6. what is the most difficult thing about (learn) to become an eloquent speaker?

-it mastering the language

7.(look) at the audience ,the contest gave her answer with confidence

8.(practice) insentively lam is now quite sure of his success in the coming competition

9.one of the journalists told us to start early (remind) us that the roads would be crowded

10.(enter) the WTO Viet Nam can now see new opportunities and challenges

11.never have the enterprises worldside seen the global competition (become) so harsh 

12.(learn) all the rules of chess the contestants started to play the first game

the thieves didn't know that the police were right after them.

=>little ...