When the old man _______to walk back to his house，the sun________itself behind the mountain．
A．was starting；hid B．had started；had already hidden
C．had started；was hiding D．started；had already hidden
I wrote a letter of complaint(投诉)，and the airline have promised to _______the matter．
A．1ook at． B．1ook into C．1ook after D．1ook out
I'm happy that you agreed to work with us again．and I look forward to______
you next week．
A．being seen B．see C．seeing D．having seen
--- Could I use your computer for a few moments, please?
--- ________. I’m not using it myself.
A. Come on B. It depends C. Go ahead D. That’s great
People have always been curious _________ how living things on the earth began.
A. in B. at C. of D. about
I really don’t think my best friend will be angry, but I’11 go and see her，in
case she _______.
A．will be B．is C．does D.has been
