Cho dạng đúng của động từ trong ngoặc:
1. Next week, Lan ( not visit) ... the petronas Twin Towers
2. I think ( use) ... source of energy effectively.
3. I should ( play) ... sports to keep fit
4. Listen! My classmate ( sing) ... an English song.
5. What ... she ( do) ... to rednce traffic jams now?