.As reported in the essay by Prof. Brown, it is only in the most difficult circumstances ________ a man’s abilities are fully tested.

My father usually ________ a shower ________ ten in the evening. [ ]

is your trip to Beijing. — It’s about 2 days. [ ]

I often play basketball ___ my sister. [ ]

We _______ talk loudly when we see the sign “ Be quiet ”on the right.