After the new technique was introduced, the factory produced______ tractors in 1998 as the year before.

 Jane has been so _______ in getting used to everything that she hasn’t had time for social activities. 

 This kind of exercise is most _______, and therefore is a good test of your students’ ability.

—I’m really hungry now.That’s because you have left your lunch __________. 

That room is 20 square meters. This room is three times as        .