He _______ when the teacher came in. A: A.sang B: B.has sung C: C.was singing

I ______ it about two days ago. A: A.have B: B.has C: C.had D: D.having

Many a student ___that mistake before. A: A．had made B: B．has been made C: C．have made D: D．has made

The project to clear up the polluted river _______ by the end of next year. A. is being completed B.has been completed C. will have been completed D. will have completed

-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

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

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

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

—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

2. Anyone ________ the website. A: has an access to B: has access to C: has access for