________ an important decision more on emotion than on reason, you will regret it sooner or later.
As many as 100 species of fish, some ____ to these waters, may have been affected by the pollution.
— Have you seen ____ pencil? I left it here this morning. —Is it _____black one? I think I saw it somewhere.
---Could I use your computer for a few minutes, please? --- ________. I’m not using it myself.
It was at 10 o’clock last night __________ the visitors finally arrived at Pudong International Airport.
—How many times have you been to China? —In fact, it is the first time I __________ here.