单项选择题
______ that the formation of the sun, the planets, and other stars began with the condensation of an interstellar gas cloud.
单项选择题 Most of the earliest ______ into America came from Europe.
单项选择题 I Called at his house but was refused ______.
单项选择题 ______ is announced in the papers, our country has launched a large-scale movement against smuggling and fraudulent activities in foreign currency exchange deals.
