The invention of the typewriter was a great_______ to communication and printing.
| A．contribution | B．devotion | C．revolution | D． construction |
-- I hear Alice was badly injured in the accident and sent to hospital.
---_______, we should go and see her immediately.
| A．If so | B．When necessary |
| C．On condition that | D．Believe it or not |
Mr. Brown’s condition looks very serious and it is doubtful if he will ________.
| A．pull back | B．pull up |
| C．pull through | D．pull out |
When talking about doing exercise, you should choose an activity that you enjoy and _____ that you will stick with.
| A．the one | B．one |
| C．不填 | D．another |
--- Excuse me, but may I have access to the Wi‑Fi here? I’d like to take some photos of the delicious food and update my microblog.
---- . Here is the key to it.
| A．By all means. | B．You said it. |
| C．Allow me, sir. | D．Out of the question. |
Don’t be so discouraged. If you _______ such feelings, you will do better next time.
| A．carry on | B．get back |
| C．break down | D．put away |