Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
A、countingWhenmakingmoderncameras,peoplebeganto_______plasticsformetal.
Weare_______attherapidprogressMarkhasmadeinthissemester.
Pleasebeserious.Iamnot_______.Youshouldconsideritcarefully
John_______tobeapoliteman.Butinfactheisveryrude.
Ihavenotheardanythingfromhimsincehis_______.