[1]
(1) is eaten by → is eaten ※by不要：around the worldはピザを食べる人ではない
(2) 〇
(3) were planted by → were planted ※by不要：yesterdayは花を植えた人ではない
(4) 〇
(5) 〇
(6) was carried out ※carry out …(…を遂行する)は熟語なので、「一語のように」考える
[2]
(1) (What) (was) (stolen) from the safe last night?
(2) (How) (was) this plant (brought) into Japan?
(3) (Where) (were) the remains of that ancient city (discovered)?
(4) (When) (was) this landscape (drawn)?
(5) (Whose) name (was) (written) on the contract?
[3]
(1) This (picture was taken by a famous photographer), so it should be worth a lot.
この写真は有名な写真家が撮ったものなので、すごい価値があるはずだよ。 ※不要：took
(2) In case of rain, (the game will be put off until) the next sunny day.
もし雨が降れば、次の晴天の日まで試合は延期されます。 ※不要：postpone
(3) A (presentation will be made by Lisa) at the next meeting.
次回のミーティングでリサがプレゼンテーションをします。 ※不要：make
[4]
(1) Our house was built about fifty years ago. 約50年前に我が家は建てられた。
(2) When were these ancient ruins discovered? これらの古代遺跡はいつ発見されましたか。
[5]
(1) Many new types of (machines are being invented). ＜現在進行形・受動態＞
(2) This book (has been read by) many children. ＜現在完了形・受動態＞
(3) (The problem was not being discussed) at the staff meeting. ＜過去進行形・受動態＞
(4) (Have his novels been translated) into many foreign languages? ＜現在完了形・受動態＞
[6]
(1) They are being interviewed now. ＜現在進行形・受動態＞
(2) We were surprised at the size of the earthquake this morning.
※be surprised at … …に驚く
(3) He was absorbed in playing online games.
※be absorbed in ～ing ～することに夢中になっている
[7]
(1) The restroom was being cleaned when I tried to use it this morning. ※不要：been
今朝駅のトイレを使おうとした時、トイレは清掃中だった。
(2) You (should be concerned about) your health. ※be concerned about … …を気遣う
自分の健康に気遣うべきだよ。 ※不要：by
(3) This copy machine (has not been fixed) yet.
このコピー機はまだ修理されていないよ。 ※不要：have
[8]
(1) I was surprised at Ken's musical performance. 私はケンの演奏に驚いた。
(2) The problem has already been solved. その問題は既に解決されている。
参考にしてください。
