It won’t be quite a long time ________ your son is back, so don’t be worried.
We should consider the students’ request _____ the school library provide more books on popular science.
Working hard is not only a _____ of great success, but it is among the essential requirement.
We were strongly recommended that we _____ in Malaysia.
_____ in Harvard is _____ most students wish for.
He didn’t _____ to what I said because his mind was on something else.