----This returned Chinese scholar has become one of the top experts in this field.----Yes,I know him very well.He____in Africa with animals for eight years.

– Will you be able to see Jennifer’s parents when the first class is over?– I’m afraid not. I ______ a lecture on British literature in the hall.

Experiments of this kind ___in both the U．S and Europe well before the Second World War．

---Have you moved into the new house?  ---Not yet, the rooms ___.

She said her grandmother ______ in 1937.