cannot press enter when expect is running?

script such as

-sharp!/usr/bin/expect  

set timeout 30     
spawn bash  centos7_client.sh    
expect
 {
 "sharon@192.168.27.156"s password:" {send "pwd\r" ; exp_continue }  }   


expect "sftp>"     
send "put -r /home/xu/Documents/scripts/centos7  /home/sharon/Docuemnts/scripts \r"   
interact

there was a prompt to confirm whether to overwrite at the earliest time in the operation. As a result, I immediately typed in
put-r / home/xu/Documents/scripts/centos7 / home/sharon/Docuemnts/scripts

I look completely confused about this operation.