______ at the top of the Oriental Tower, people below will look very small.

While previewing his lessons, the little boy will make a question mark ________ there is a question.

_________ hard one may work, one cannot master a foreign language in a year or two.

--Did Mary return late last night?
--No. It was not yet 7 o’clock _________ she arrived home.

_________ across the railway, a train hit it.

“My boy, do remember to leave things _____ you can find them again.

Mark needs to learn Chinese _______ his company is opening a branch in Beijing.

House prices vary from place to place and are usually high ____ there are famous schools.

______ this village was extremely poor, they felt it was still important to keep the school going.

—Time is limited. I have to finish this tonight.
—But it’s midnight now and you should have a sleep ______ much work you have to do.