.— Why was Professor Johnson unhappy those days?— Can’t you see it clearly? The only reason was that the theory he stuck to________ wrong.
27.I don't know_____________makes her afraid of having her business discussed.
28.Which sentence is wrong? 29.
33.I don't think_____________difficult for a Chinese student to master a foreign language within five years 34.
35..It's the second time you_________late this week. 36.
37.It will not be__________we meet again. 38.