临床试验和临床研究的正确方法是：
Americaisan__________country.Youcanhear__________everywhere.
--Mike,you’vegotsomanybeautifulstamps.
--Yeah.I_________collectstampswhenIwasinprimaryschool.
TheshoesaremadeinWuxiCity,______isfamousforit'sproductsoflightindustry.
Theshop_________until7o’clock.
Thestormdiedawayatlastwiththegoldenwaves__________theshoreinpeace.
Atthismomentthebellrang,________theendofclass.
Ithinkthispairofshoesdoesn’tfityou.It’sabitlarge.You’dbettergeta_____.
I'llneverdo______.
改革开放后，对外贸易在国民经济中的地位大大提高，1997年我国外贸依存度已达()。
《海关法》规定的纳税期限为海关填发税款缴纳证之日起()