Researchers (1) ... (just / carry out) a study to discover what makes us happy. We (2) (speak) to a wide range of people last week. said a research spokesperson. Even though we (3) ... (yet / not collate) all the results, we (4) ... (already/make) some important findings.' Perhaps researchers (5) ... (find) the key to happiness after all.

svkalin    2   25.09.2021 12:01    56