1. They (leave/ leaving/ left/ leaved) for Singapore two weeks ago. 2. "Which (country/ cotinent/ city/ area) is Britain in?" - "Europe" 3. A hi-tech robot will help us (look out/ look after/ look in/ look at) children while we are film. 4. Do you know (popular/ more popular/ more and more popular/ the most popular) drink in Viet Nam?