Effective measures should be taken to ______ the rare species _______ being over-killed by human beings.

Having entered the classroom, the teacher ___ the book on the desk.

North Europe __________ Norway, Sweden, Denmark, Finland and Iceland.

Her child was crying, but she ___________ him and carried on with her work. 

Einstein liked Bose’s paper so much that he ________ his own work and translated it into German.