—Mum, where are my new socks?
— How _______ I know? You’d better not put your things everywhere.
| A．shall | B．will | C．should | D．might |
They went out ______ water.
| A．in search of | B．in a search of |
| C．in search | D．search |
After three years of hard work, they at last _____ all the money they had borrowed.
| A．paid off | B．paid back | C．paid in | D．paid for |
---I don’t know how to write the article assigned by our professor on international trade.
--You should have ______ your attention on the lecture that ______ how international situation affects exports and imports across the globe.
| A．put; concentrate on | B．paid; talked about |
| C．fixed; dealt on | D．focused; focused on |
The operation room in every hospital has to _______bacteria of any kind so that the patient being operated on doesn’t get infected.
| A．keep free from | B．make it free from | C．to be made free with | D．be kept free from |
The father has been ____ for many years in order that his only son can be ____ with higher education.
| A．fighting; served | B．struggling; equipped |
| C．working; offered | D．laboring; received |