Choose the correct from of the verb:
1. I (did, had done) shopping by 3 o’clock yesterday.
2. Ye (had received, received) the telegram by that time.
3. My brother (tried on, had tried on) the raincoat before he (bought, had bought) it.
4. They (went, had gone) window-shopping yesterday.
5. We (bought, had bought) vegetables before our mother (had come, came) home.