Children’s brains cannot develop       they lack protein (蛋白质).

A．since                          B．when                  C．because               D．unless

Tom’s teacher kept on telling him that he should read English every day, but      didn’t work.

A．he                              B．which                 C．it                        D．all

Recent research       that people who don’t sleep well will easily get ill.

A．showed                      B．has shown           C．will show            D．is showing

Unexpectedly,         his stepping out of the taxi he was arrested by two policemen.

A．on                             B．about                  C．in                       D．at

When       help, one often says “Thank you” or “It’s kind of you.”

A．offered     B．offering    C．to be offered    D．to offer

Although the country has had political independence for over a century,        it needs the support of its neighbors.

A．naturally   B．economically    C．especially  D．luckily

These countries will join one another against terrorism,        was agreed to at the international conference.

A．that                            B．who                    C．as                       D．what

--- Henry doesn’t seem like the same person.

----         so much in life has made him more thoughtful.

A．To see      B．His seeing C．Seen  D．To be seeing

Research findings show people spend about two hours dreaming every night, no matter what they          have done during the day.

A．should      B．would       C．may D．must

Young couples nowadays are going to bring up their children differently from the      they were brought up.

A．background                B．family                 C．time                    D．way