1.he will come back (within two months)对打括号处提问.
2.( )－Who _____climb this tree?
－I'm afraid no one____.
A.could;can B.can;can C.can;could D.can;couldn't
3.( )－______they finish the work today?
－No,they_____.
A.Can;can't B.Could;can't C.Can;can D.Can't ;can