Can you tell me when the plane _______ to Hong Kong this evening?
It is the third time that he ________ the first prize in the competition.
I don't like the pop singer's songs. In fact, I've trouble ________ the words of his songs.
________I was in trouble, he would come to help me out.
—Tom loves surfing the Internet.—______ and ______.
Over 20% of the students at that school _____ the habit of smoking, which is beyond imagination.