Only when____ 30 years old _____ to learn English.

99. A 100% ______ dress can keep peoplerefreshed in summer and warm in winter.

35．He fell into the couch and turned on the TV. Unaware ofthere_________a snake lying near his feet.

He is such a clever student _________ everyone likes.

Some high officers were punished by law only because they were _______ what didn’t belong to them.