Compscientificskill that have made Zhongguancun________-success.

Susan didn’t finish the job on time. Now Mr Brown realizes that he ______ too much of her then.

Zhong Nanshan, the famous medical scientist, has devoted most of his life ________ useful ways in treating cough diseases.

Rumors were already beginning to ________ that the project might have to be abandoned.

Some insects________the colour oftheir surroundings to protect themselves.