The art show was________being a failure；it was a great success.

After the amateur singer competed in the program The Voice of China, his singing career   .      

Butterflies ________ a sweet liquid produced by flowers, which bees and other insects collect.

It should be emphasized that our technology has great potentials ________ food development in China.

—What do you think of the news in today's newspaper?
—We shouldn't ________ the trouble of helping others only because what we do may invite trouble.

I don't agree with your plan. You should never put your fortune ________ luck.

—What a pity that he missed his final shot and ended in a tie!
—Yes, but he didn't lose it ________！ It just wasn't his day.

________ giving a general introduction to computers, the course also provides practical operation.

We ________ contact with each other for years. And last week we ________ contact again.

They have________signs in some places to remind (提醒)the visitors not to step on the grass.