UNIT 15: SPACE CONQUEST
LANGUAGE FOCUS (TRỌNG TÂM NGÔN NGỮ)
Grammar and Vocabulary
Exercise 1. Dùng could/couldn ’t hay was / wasn't able to để hoàn tất câu.
ĐÁP ÁN
1. couldn’t / wasn’t able to
2. was able to
3. could / was able to
4. was able to
Số hoàn hảo giống như người hoàn hảo, rất hiếm có.
Perfect numbers like perfect men are very rare.
Rene Descartes
