Hardly had we reached home （ ） it began to rain.
（A）before
（B）than
（C）as soon as
（D）when
The new secretary is supposed to report to the boss as soon as he （ ）.
（A）will arrive
（B）arrives
（C）is arriving
（D）is going to arrive
（ ） we were staying in China, we saw many interesting things.
（A）Since
（B）While
（C）After
（D）During
