Yesterday I was walking downstairs when I missed my foot and had a bad fall, nothing serious, ______.
| A．even | B．either | C．then | D．though |
Last night, before the exam, I went over the lessons I couldn’t keep my eyes open to stay awake any longer.
| A．before | B．until | C．unless | D．when |
Too high house prices can be brought under control the authorities introduce a series of regulatory policies.
| A．even if | B．as if |
| C．so that | D．provided that |
Children should be instructed to put things they belong in their early childhood.
| A．where | B．in which |
| C．to which | D．what |
it is normal for parrots to talk, Einstein, a small bird, is unusual in that whenever she hears a new word or sound, she repeats it over and over until she masters it.
| A．As | B．When | C．While | D．Since |
Jordan kept his illness from his opponents before the final game they might know about it.
| A．now that | B．on condition that |
| C．for fear that | D．in order that |