It’s very difficult for him ___ English well .A .learns B. learn C. to learn
We have had several visits ______the famous nature zoo.
She’ll come back in _______ hour ,
- I'm going on a trip to Singapore after the exam. - Really? _______!
- When did your parents _______? - They _______ for 20 years.
-_______ do I save the document on the computer? - Please click 'save' and write a name for it.