_____ learn English well, we must listen to the teacher carefully.[ ]

Time is not enough for so much work. ____ people are needed, I think.

Look, what a heavy rain! What shallwe do now? — ____________ it’s raininghard, let’s stay at home to surf on the Internet.

al evidence began to__________, suggesting that thenew drugs had a wider range of useful activities than had been predicted fromexperiments in animals.

Jane had just finished her homework ________ her mom asked her to practice playing the violin yesterday