Some insects take on the color of their surroundings to ________ themselves.

What do you think of the conference?—As far as I am concerned, that conference________ successfully last night．

__________ she couldn’t understand was_________more and more students showed little interest in their lessons

On workday mornings I usually ________ an hour driving to work because of the traffic jam.

He is not good at learning English and he always does his homework_______.