`1.` Ba suggested that chicken shouldn't be eaten to avoid being infected with bird flu.

Giải thích: Bị động với động từ khuyết thiếu: should be Vpp.

`2.` The questions are easy enough for us to answer.

Giải thích: be adj enough for sb to V: đủ... cho ai đó... để làm gì...

`3.` There were so many people here that they had to wait long.

Giải thích: so...that: quá...để mà...

`4.` May Day is a day on which people don't work.

Giải thích: Mệnh đề quan hệ với giới từ: giới từ + đại từ quan hệ

`5.` She is the most hard-working girl whom you have never known before.

Giải thích: Đại từ quan hệ "whom" thay thế cho tân ngữ "her" đứng sau động từ "known"

@ `Ly`

1. Ba said: "Why don't we stop eating chicken to avoid being infected with bird flu?" - Ba suggested that chicken shouldn't

be eaten

2. The questions are easy, so we can answer them - The questions are easy enough for us to answer

3. They had to wait long because there were a lot of people here - There were so many people here that they had to wait long

  4. May Day is a day. People don't work on that day - May Day is a day when people don't work on

5. She is the most hard-working girl. You have never known her before - She is the most hard-working girl whom you have never known before