Students enrolled as full-time can fully____in the university extracurricular clubs.
A. had participated
B. participant
C. participating
D. participate
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If you get your bank to generate a money order, it usually ______ conversion fees.
A. charge
B. charges
C. charging
D. is charging
电器着火时,下列不能用的灭火方法是哪种()
A. 用四氯化碳或 1211 灭火器灭火
B. 用沙土灭
C. 用水灭火
Excel Energy Corporation's new online training program has _______ (interact) features and forum discussions for trainees.
变形观测的正负号规定中,对水平位移 向()为正,()为正;反之为负。对竖向位移,()为正,()为负。对裂缝()为正,()为负