1.I’m sorry to have _________ you with so many questions on such an occasion
A.interfered
B.offended
C.impressed
D.disturbed
2.I only work __________ weekdays, not __________ weekends
A.on... on
B.at...at
C.on...at
D.at...on
3.She grabbed the soap and washed __________
A.thoroughly
B.thorough
C.although
D.though
4.Piano is a popular _____________
A.machine
B.instrument
C.equipment
D.tool
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