1. Of the thousand of varieties of bird species in north America, ______ brigh
t red plumage, like the cardinal, are most often designated as state birds.
為什麼不能選which have
答案是those that have
2. Only a small _____ of people took creative studies beyond secondary school
level.
答案是handful 為什麼portion不行呢
3. I don’t think Tom enjoyed （helping）me study for the test.
這題請問是省略了關代that嗎？ 掛號中的helping是因為前面是 enjoy 所以後面需加in
g嗎？