Trả lời: 1. While we________ information for our presentation last month, we discovered that lots of people in our neighbourhood needed help.A. were collecting B. are collecting C. collect D. collected2. When we...
Trả lời: 1. We (decide) decided to form a volunteer club while we (prepare) were preparing for our group presentation about people in need.2. When we (arrive) arrived at the gate of the primary school at 5:30 p.m., lots of children still (play) were playing in the playground.3. I (decide...