【C2】A．contributedB．informedC．spreadD．conceived

The tube in a boiler should be blinded if found _____.A.scaledB.informedC.leakyD.deformed

【C4】A．contributedB．discoveredC．inventedD．generated

The Oscar best actor ______ his success more to luck than to ability.A．contributedB．celebr

【C9】A．contributedB．distributedC．distressedD．disturbed

A．ensureB．separateC．spreadD．switch

The shop assistant _____ out the food on the counter.A.laidB.displayedC.spreadD.arrang