题干

用所给词的适当形式填空   
1.There____ (use) to be a lot of manatees.
2.So far, no man____  (travel) farther than the moon.
3.How long ____you____ (be) in Ningxia? 
4.If it____(be)a nice day tomorrow, we can go out for a picnic.
5.The aggressive animals should____  (put) in cages.

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答案(点此获取答案解析)

used ​,has travelled​,have,been​​,is​,be put