1. Hey, you bumped into me!
2. He/She hasn't replied the phone because I haven't found him/her.
3. You may have a seat first.
4. Once I find him, I will call you.
5. Choose some suitable suppliers to join the conference on Tuesday.
2.He(She) has not replied the telephone(phone), because of me cannot find him (her)!/ He(She)has not replied the telephone(phone) , so I cannot find him(her) !
3.You can sit first.
4.When i find him(her) , I will tell him(her) to call you immediately .
5.I will find some suitable supplier to come to the meeting on tuesday .