І. Put the verbs in brackets into the correct tense forms.
1 We (not be able) … to gain this power until the current technology (be changed) … .
2 We (tell) … him when he (return) …home from work.
3 I (not pay) … you until I (get) … the pay cheque.
4 I (not talk) … with him until he (apologize) … to me.
5 When the phone (ring) …, somebody (pick) … it up.
6 Till the streets (be) … full of cars, I (stay) … here
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