Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.
A、surroundThisboywas_______forwhathehaddoneintheclass.
Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
Whentravelingaloneinthemountains,you’dbettertakea_______withyouincaseyougetlost.
Ihavenotheardanythingfromhimsincehis_______.
Weare_______attherapidprogressMarkhasmadeinthissemester.
