The new technique has_____ them to double the production of the factory.

Ever since she was young, she has_____ herself a goal to become a doctor.

Mr Smith, there's a man at_____ front door who says has_____ news of great importance for you. A: the;/ B: the;the C: /;/ D: /;the

The university has_____ another large laboratory for students to design more complicated robots. A: set off B: set up C: set out D: set about

-Where is your father?-He ________ Australia and he ________ Sydney for two weeks. A: has been to;has been in B: has gone to;has been in C: has been in;has been to D: has gone to;has been to

10. With his hard work, John ____ the basic knowledge of computer.A. has caught B. has acquired C. has required D. has acknowledged A: A. has caught B: B. has acquired C: C. has required D: D. has acknowledged

—Where are the twins? —One ________ flowers and trees in the garden, the other ______ to help her. A: has watered, has gone B: is watering, has been C: is watering, has gone D: has watered, has been

John has never been on time, ( )? A: as John B: has not John C: has he D: has not he

He ____never ____ a problem with his boss. A: has ...has B: has ...had C: has ...have D: had ...had

What has happened to Bob A: He has retired. B: He has fallen ill. C: He has gone for a business. D: He has been late for work.