Номер 4а

Ответ:

1. sent
2. was feeling
3. cheered
4. have already been
5. have never been
6. have been studying

Почему:

• 1) sent — last week указывает на завершённое действие в прошлом → Past Simple.
• 2) was feeling — состояние, происходившее в тот момент, когда пришли цветы → Past Continuous.
• 3) cheered — законченное действие в прошлом → Past Simple.
• 4) have already been — действие связано с настоящим: Клэр уже несколько дней снова ходит в школу → Present Perfect.
• 5) have never been — опыт до настоящего момента с never → Present Perfect.
• 6) have been studying — действие началось в прошлом и продолжалось в течение последних двух ночей; важен процесс → Present Perfect Continuous.

Проверка в тексте:

…the lovely card and flowers you sent me last week…
…when I was feeling very low…
…they really cheered me up.
…I have already been back at school for a couple of days.
I have never been so busy.
For the last two nights, I have been studying until midnight…