A．doB．areC．have

【C18】A．is beingB．areC．have beenD．is

Four hours（) too long for him to write the letter.A、 hasB、 areC、 isD、 have

Richard works really hard,and_____ you.A.so doB.so areC. so did

The rich ______ not always happy .A、isB、areC、hasD、have

How much rice there in the jar？A.isB.areC.haveD.h

I have trouble in ________ my homework.A doB don