Do you think David the most suitable person?（the most suitable person ）是直接宾语还是间接宾语?
答：是直接宾语.
举个例子
A:Tom gave me a book.
B:Tom gave a book to me.
A中直接宾语是a book 间接宾语是me
B中直接宾语是me间接宾语是a book
Many volunteers —have flew—（fly）to the poor areas to treat people with eye problems before.
答：Many volunteers —have flew—（fly）to the poor areas before.
把原句中to treat people with eye problems 表目的短语 先拿掉,这样看就知道 before 是现在完成时的标志了.
My hometown used to be a small place__C__with _____it is now.
Acompared ,how Bcomparing,what
C compared ,what Dcomparing,how
答：被比较,ed分词有被动的意思,第二个空根据句意就知道要用what