You'd better tell him what to do next as soon as he _______ back.
A:come
B:came
C:is coming
D:comes
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It is impolite to _______ in others' private affairs.
A:interfere (in/with)
B:involve (n./v-ing)
C:interrupt
D:influence
Eventually, they gave up the project to build a bridge over the river because of the _______ high costs it would involve.
A:excessively
B:expensively
C:effectively
D:efficiently