Some supervisors are reluctant to …. responsibilities because they know they will be held accountable if something goes wrong.
A.ask
B.delegate
C.encourage
D.share

The building owner generally does not …. tenants to make renovations in their units.
A.permit
B.commit
C.transmit
D.submit

A group of environmentalists …. concerns about recent drastic environmental change including temperature increases in Northern Canada and Russia.
A.requested
B.left
C.understood
D.addressed

By the time John.... to help, we.... the work.
A.comes / finished
B.comes / will have finished
C.will come / will have
D.came / have finished

Mary sometimes.... to turn off the computer before she.... home.
A.forgot / had gone
B.has forgot / is going
C.is forgetting / has gone
D.forgets / goes

They.... good preparations before they.... their final examination yesterday.
A.made / had taken
B.had made / took
C.have made / take
D.will have made / have taken

He.... a birthday party tomorrow for his daughter who.... three.
A.is having / turns
B.will have had / will turn
C.is going to have/ has turned
D.has had / is going to turn

When Susan.... yesterday, Peter.... dinner. He.... cooking very much and often.... the meals himself.
A.phoned / was cooking / likes / prepares
B.had phoned / cooked / liked / prepared
C.was phoning / was cooking / has liked / is preparing
D.has phoned / is cooking / is liking / preparing

They.... to finish their work because they.... Los Angeles next Sunday.
A.are needing / visit
B.need / are going to visit
C.have needed / are visiting
D.needed / have visited

Ever since human beings.... the Earth, they.... use of various form of communication.
A.have inhabited / have made
B.inhabited / are making
C.had inhabited / had made
D.inhabit / make