He is known _____ a scientist and famous _____ his research on rice.
| A．for; as | B．for; for | C．as; for | D．as; as |
The man we followed suddenly stopped and looked as if _________ whether he was going in the right direction.
| A．seeing | B．having seen | C．to see | D．to have seen |
-- How can you ________ that he is from the North.9 -- Simply by his accent.
| A．get to know | B．say | C．realize | D．tell |
Whenever I go to Shanghai, _________ is quite frequent, I will visit my former teacher.
| A．which | B．where | C．it | D．as it |
It is fairly common in Africa for there ___________ a group of expert musicians surrounded by others who also join in the performances.
| A．being | B．to be | C．be | D．is |
There is a feeling in me _______ we will never know what a UFO is.
| A．that | B．which | C．of which | D．what |