1 . Judging from Einstein’s life story, we can form a conclusion that a late developer may not mean ______ (be) a failure in the future. (所给词的适当形式填空)

2 . The number of foreign students attending Chinese universities, together with a large number of new majors, ________rising steadily over the past two decades.

A．was

B．were

C．have been

D．has been

3 . It ________(be) more than years since the first computer was invented. (所给词的适当形式填空）

4 . Seated in the studio today ________(be) a writer and lecturer to help answer these questions.