We find _______ not easy _______ fifty English words in one day.

For the sake of your health, I’d rather you ___ a flat in the mountain than ___ in downtown area as the transport is getting more convenient.

_____ worries the doctor most was _______they could find the cause of the disease.

She was afraid __________ the dog in caseit became dangerous.

(2011·福建高考)—Shall I inform him of the change of the schedule right now?—I am afraid you ________， in case he comes late for the meeting.