Learning a foreign language calls for your memory, time, patience and emotions.____, it is not a simple thing.
| A．As a result | B．In short | C．In generally | D．In the conclusion |
We are roommates for 3 years and never once __________ .
| A．we have quarreled | B．have we quarreled |
| C．do we quarrel | D．did we quarrel |
I will never forget the park __________ I spent so many happy hours there with my parents last summer .
| A．where | B．because |
| C．which | D．so |
In fact , the hazy weather problem is so severe now that it has aroused __________ nationwide concern about __________ environmental pollution .
| A．/ ; / | B．/ ; the |
| C．a ; / | D．a ; the |
– I spent three hours buying a train ticket at the railway station the other day .
-- Why ? You __________ one on the Internet or by phone .
| A．could have bought | B．must have bought |
| C．would buy | D．should buy |
The newly married couple couldn’t afford to buy a new car ; __________ , they bought a used one .
| A．however | B．instead |
| C．otherwise | D．still |