Tom could _________ in the garage when I came around, which would explain why he didn't hear the bell.
Cấu trúc: could have been doing: có khả năng đang làm gì đó tại một thời điểm nhất định trong quá khứ nhưng đã không làm.
Only one of our gifted students______to participate in the final competition.
She asked me______I was looking at.
In spite of her abilities, Laura has been_____________________ overlooked for promotion.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
Education in many countries is compulsory________the age of 16.
Tom: "___________________ " Mike: "I won't say no!"
__________ John Kennedy was elected president, he was the youngest American President ever.
Standing on the tip of the cape,____________________ .
Stephanie: "Oh, no! I left my book at home. Can I share yours?" Scott: "______ "