－Last semester, he had a hard time______ English.
| A．learns | B．learning | C．to learn | D．learnt |
Nothing can stop the Sandstorm ___________ more and more trees are planted．
| A．unless | B．if | C．when | D．while |
My mother was angry with me because I____________ last night .
| A．am seen to play computer games |
| B．was seen to play computer games |
| C．was seen play computer games |
| D．am seen play computer games |
China ________ the Great Wall in the world.
| A．is knew for | B．is famous as |
| C．is known for | D．is known to |
_____________speak ___________ in _______________.
| A．Germen, German, Germany | B．Germans, Germany, German |
| C．Germans, German, Germany | D．Germen, Germany, German |
There are many tall buildings on ____ sides of the street .
| A．each | B．every | C．both | D．either |