In the playground I saw a boy ___ I thought was your brother.

Since it is expected that Fed will cut interest rate again, there is no doubt ___the company will make the decision on raising the price of crude oil.

Once upon a time，a(n)________famous scientist said that life was not easy for any of us but first of all we should believe in ourselves.

Canada’s economic wealth is closely linked to _______ of the US, which buys three-quarters of its exports.

No dictionary can ______all theEnglish idioms.