185．By using ears one can tell the direction_____ a sound comes．

　　 A in which　　 B from which

　　 C．with which　　 D．through which

184．I don’t believe the reason____ he has given for not coming to the lecture．

　　 A why　　 B that　　 C．how　　 D what

183．In the forest we observed some trees____ the leaves were black with disease．

　　 A where　　 B of which　　 C in which　　 D．whose

182．I often think of the years____ 1 worked with the foreigners．____ has had a great effect on my later lift

　　 A that；which　　 B．when；which

　　 C．which；that　　 D when；who

181．He expressed his hope_____ he would visit China again the next year，and this was the very hope___ he　　 expressed as soon as he arrived in the country．

　　 A that；that　　 B　 which；which

　　 C．that；which　　 D．which；that

180．____ has finished the task ahead of time will be rewarded．though we don’t know who it will be．

　　 A Those who B．Anyone　　 C．Whoever D Who

179．The changes in our chemistry lab will cost quite a lot，____ they will save us money in the long run．

　　 A or　　 B．since　　 C．for　　 D．but

178．1 remember _____the company only owned a small shop．

　　 A when　 B．how　　 C whether　　 D what

177．The workers were making so much noise in the workshop，and the boss hurriedly went to see___．

　　 A what the matter was　　 B．what was the wrong

　　 C．what wrong was　　 D．what was the matter

176．This is certainly the case，but____ it is a mistake or not I don’t know．

　　 A if　　 B．even though　　 C．whether　　 D that