The government has taken some measures to solve the shortage of electricity, but it will be some time_________ the situation improves.
A. since B. when
C. unless D. before
I’d appreciate _________ if you would like to teach me how to use the expression once more and I always appreciate _________ me with my English in the past.
A. that; you to help B. this; your helping
C. it; you to help D. it; your helping
_________, the student insisted that he should be separated from his roommates, who were noisy.
A. To avoid being affected B. To avoid to be affected
C. Avoiding being affected D. Avoiding to be affected
_________ more and more forests damaged, some animals and plants are facing the danger of dying out.
A. As B. For
C. With D. By
People can unlock the shared bikes, _________are equipped with GPS and can be left anywhere in public, by simply _________their smart phones.
A. which; use B. which; using
C. of which; use D. of which; using
When I entered the step-classroom(阶梯教室), the lecture _________ and the people _________ attentively.
A. began, listened B. was begun, was listening
C. had begun, listened D. had begun, were listening
