单选 1.Professor Wang is giving a lecture on__phyics.A.a B.an
单选 1.Professor Wang is giving a lecture on__phyics.A.a B.an C.the D./
2.What_pity that he has missed the change!
A.the B.a C.an D./
3.I will try to_who stole my wallet.
A.look for B.look up C.find Dfind out
4.Look,the whole room is covered__dirt.
A.by B.for C.with D.at