4．
(1)I have no idea __________ the movie Captain America will be popular in Sanming or not.
(2) Father makes a promise to his son _________ if he behaves well, he shall get a gift.
(3) Ten thousand dollars __________(be) quite a large sum.
(4)___________(play) football ___________(make) us grow up tall and strong.
(5) A library with fifty thousand books __________(have) been offered to the nation as a present.
(6)He always __________(devote) most of his time to ___________(do) research.
(7)The number of people who __________(enjoy) traveling abroad __________(have) been increasing rapidly.