_____ you don’t lose heart, I’m sure you can pass the coming examination.
| A．Unless | B．As long as | C．If not | D．Although |
In_____ communication, a smile is usually _____ strong sign of friendly attitude．
| A．the; 不填 | B．a; the | C．不填; a | D．the; a |
— Do you still remember how we first met?
— Yes, you ________ to my office and ran into me on the way.
| A．were walking | B．walked | C．had walked | D．walks |
As many as five courses are provided, and you are free to choose _____ suits you best.
| A．whoever | B．whichever | C．whenever | D．wherever |
On many trains and buses, there are some special seats ________ out for senior citizens.
| A．marking | B．marked | C．to mark | D．mark |
The number of foreigners that ________ to Huaihua ________still increasing.
| A．come; is | B．comes; is | C．come; are | D．comes; are |