It is only by practising English for several hours every day _________ be able to use it freely.

How long is it ___ the new math teacher came here? — wo weeksThe students just wonder how ___ they can go with him.[ ]

__ US newspaper reported, that fromnext autumn, ________ new computer system will follow the progress ofinternational students at their schools in the USA.

Does the idea of working abroad________you?— Yes.But I have no chance. [ ]

You can’t see things clearly through a telescope unless it is ________ correctly to your sight.