An idea came to him ___ he might do the experiment in another way.
A．which B．when C．what D．that
It is so wet there that the trees are extremely tall, some ________ over 90 metres.
A．are measured B．measuring C．measured D．measure
Rather than ___ on a crowded bus, Tom always prefers __ a bicycle.
A．ride; ride B．riding; ride C．ride; to ride D．to ride; riding
Perseverance is a kind of quality --- and that’s ________ it takes to do anything well.
A．why B．that C．which D．what
A heavy learning burden leads to unhealthy behaviors such as poor eating habits, which ___ damage the health of students.
A．in its turn B．in return C．in turn D．by turns
How did you ___ to paint the whole house in a week?
A．try B．manage C．win D．succeed
