__ with some research materials, he decided onthree possible approaches in his experiment.

Some people care much about their appearance andalways ask if they look fine in ______ they are wearing

Let’s hold a party to your birthday and at the same time you on your passing the driving test.

I asked two people the way to the station, but ________of them could help me.

Do you know _____ by the police last night — Yes, because he spread a rumor(谣言) on Wechat.