单选题 As an excellent shooter, Peter practised aiming at both ______ targets and moving targets.

单选题 Slavery was ______ in Canada in 1833, and Canadian authorities encouraged the slaves, who escaped from America, to settle on its vast virgin land.

单选题 Nancy is only a sort of ______ of her husband's opinion and has no ideas of her own.

单选题 The cultures of China and Japan have shared many features, but each has used them according to its national ______.

单选题 A lot of ants are always invading my kitchen. They are a thorough ______.

单选题 It may be necessary to stop ______ in the learning process and go back to the difficult points in the lessons.

单选题 The doctors ______ the newly approved drug into the patient when he was critically ill.

单选题 He tried to hide his ______ patch by sweeping his hair over to one side.