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; ______________ (do) my homework already. ____________________(not finish) his homework yet.3. There ______(be) a telephone call for you just now. ever _______(be) to Beijing?. Wu_________ (teach) us Maths in 1982. ______ never ______ (see) such an exciting match before. ______________(make) some friends since she ________ (e) to China last year. _____ just ___________(clean) the house. Please don’t e in. ___________________(practice) this dialogue twice.10. Great changes ______________(take) place over the past century.have donehas not finishedhave seenhas cleanedhave practiced語法運(yùn)用:wasHave beentaughthas made camehave taken Mr and Mrs Black ______ back _________.A. hasn’t e, yet B. haven’t e , yet C. haven’t , e already D. hasn’t e , already We haven’t seen each other ________.A. for a long time B. two days ago C. for two days ago D. a long time ago. It has been in use ________ 1998.A. in B. at C. or D. since Where are Mike and Jack?