III. Em hãy chọn giới từ thích hợp để điền vào chỗ trống.
1. We are going to play tennis_____________ the afternoon.
2. We must be at home__________ 6 p.m.
3. I gave her a beautiíul painting______________ her birthday.
4. The World Cup often starts_____________ June 10th after every 4 years.
5. The museum is open_____________ 7 a.m____________ 5 p.m