문제 4개만  좀 풀어주세요 ㅠㅠ

In an effort to diversify their holdings, Fulton Financial Services plans to ______ stock in more than forty other companies worth an

estimated $12 billion.

1) purchased     2) purchasing      3) purchase     4) purchases

A slowdown in infrastructure construction in what had been some of the most rapidly developing economies _____ a drop in prices in

basic raw materials.

1) cause         2) is caused      3) has caused      4) has been caused 

As skyrocketing food and gasoline prices strain budgets, utilities are disconnecting many more customers _______ fall behind  on their bills.

1) whom    2) who   3) whose   4) whomever

After    a week long, exhaustive investigation by a team of highly  trained specialists,  the source of the malfunction in the central controller  unit has been ___________

1) to find     2) being found    3) found    4) finding 

쉬운 거 몰라서 민망하네요 ㅜㅜ