To help with medical researches, animals are used in place of human beings in experiments.
A.researches
B.are used
C.human beings
D.experiments.

A.student



stupid
B.stupid
C.study
D.studio

A.needed
B.picked
C.liked
D.jumped

A.include
B.hut
C.rude
D.June

This stamp (collect)…………is valuable.
A.collection
B.collected
C.collecting
D.collects

People believe that 13 is an unlucky number.
A.It was believed that 13 is an unlucky number.
B.That 13 is an unlucky number is believed.
C.13 is believed an unlucky number.
D.13 is believed an unlucky number.

The last time I played football was in 1991
A.I haven’t played football in 1991
B.I haven’t played football since 1991



I haven’t played football since 1991
C.I didn’t play football in 1991
D.I last played football since 1991

He drives more carelessly than he used to.
A.He doesn’t drive as carefully as he used to.
B.He doesn’t drive carefully than he used to.
C.He doesn’t drive as carefully than he used to.
D.He doesn’t drive as carefully as he does.

The room is such dirty that it needs cleaning immediately.
A.such
B.needs
C.cleaning
D.immediately

A lot of articles about the environment have written by my classmates.
A.A lot of articles
B.about
C.the environment
D.have written