在英语越来越重要的21世纪，学好英语成了大学生的首要目标。为帮助大学生更好地掌握英语知识，特提供以下文章：
1. Although ____ Spanish, he attended the course.
A. he was knowing
B. he is knowing
C. having a knowledge of
D. knows
2. You ____ that letter to James. However, you didn't.
A. ought to write
B. ought to have written
C. should write
D. should be writing
3. Joseph was very lucky ____ with his life; he almost did not get out of the room.
A. to escape
B. to have escaped
C. to escaping
D. to be escaping
4. Bread and butter ____ liked by Westerners.
A. is
B. are
C. were
D. be
5. The back garden of our house contains a lawn, ____ very pleasant to sit on in summer.
A. which is
B. which it is
C. it is
D. where it is