I really don’t know ___ ___I kept the secret papers.

It is fairly ________ in Africa for there being a group of expert musicians ________ by others who alsojoin in the performances.[ ]

Many a professor__________looking forward to visiting Germany now.Many scientists__________studied animals and plants in the last two years.

He, together with his parents ______going to visit Shanghai inJuly. How about you?— I’m afraid I have to stay at home _ _.

________ for knowledge is very strong.