disuruh cari tenses, bingung. tolong dibantu ya

1. Since the beginning of the twentieth century, medial scientist (Have been made) many important discoveries → PRESENT PERFECT

2. I was late. The teacher (had already given) a quiz when I (got) to class. → PAST PERFECT & SIMPLE PAST

3. My brother and sister (were arguing) about something when I (was walking) into the room → PAST CONTINUOUS

4. Hi, Mike. (have you ever met) my cousin? ☞ No, (I haven't)

5. Some of them (has been standing) in line for more than 2 hours → PRESENT PERFECT CONTINUOUS

6. The anthropologist (had left) the village when she (collected) enough data → PRESENT PERFECT & SIMPLE PAST