【C2】A．callB．commentC．workD．demand

A．exerciseB．lifeC．workD．style

A．make a callB．make a cryC．make a markD．make a voice

【C9】A．matterB．holdC．workD．stand

【C5】A．introductionB．commentC．preparationD．conclusion

The machines are made _____ at full speed.A.workB.workingC.to workD.to be worked

【C4】A.lifeB.studyC.workD.education