A study shows that a tropical fish in America can survive (存活) _____ water for up to 66 hours. [ ]

If _____ carefully, the experiment will be successful.

I was never_____ t o receive a _____ result from my science teacher.

Tommy came to my home, but I didn’t want to play _____ him.[ ]

Americans eat vegetables per person today ______as they did in 1910.