4. a 45 minute test/ a 15 minute test/ a month/ There is/ twice/ and/ every week.……………………………………………………………………………………………   5. main exams/ every grade/ There are/ during/ four.……………………………………………………………………………………………

Cách làm:
- Đọc kỹ câu hỏi để hiểu đề bài.
- Phân tích cấu trúc câu và xác định vị trí của từ/cụm từ để điền vào chỗ trống.

Câu trả lời:
4. There is a 15 minute test twice every week and a 45 minute test once a month.
5. There are main exams during every grade, four times a year.

The students have a 45-minute test and a 15-minute test twice every week. Main exams are held four times during every grade.

There are main exams during every grade four times.

There is a 45-minute test and a 15-minute test twice every week.