. He must be curious about everything in the lab, for this/that/it is the first time that he has been there, ________?
Since you are going to America, do ________ the chance to improve your spoken English.
After she lost the election, her influence on the public was in ________.
I think Tom will ________ a good leader, so I'm going to vote and support him.
Let us fight against the trouble ________.
The professor combines different ________ in the same speech.