Open the brackets and put the verbs into the correct tense form: 1. At that moment, as I ( to mix) the solution for the future filling, my colleague…. (to drill ) the tooth tissues.
2. As you can see now, the varnish ….(to apply) onto the tooth, look at the dentist’s hands!

1. At that moment, as I was mixing the solution for the future filling, my colleague was drilling the tooth tissues.
2. As you can see now, the varnish has been applied onto the tooth, look at the dentist’s hands!