. Tim, you should briefly ___ the main arguments before the voting.
| A．calculate | B．identify | C．observe | D．summarize |
--- Have you really been to visit the Bird’s Nest in Beijing?
---- I ______ it last summer vacation.
| A．do visited | B．do visit | C．did visited | D．did visit |
Ten minutes had been made full ____ of ____ the problem.
| A．using; studying | B．use; to study |
| C．to use; to study | D．use; studying |
These flowers are pleasant to ______.
| A．be looked at | B．look at | C．looking at | D．for looking at |
Tom’s dog became ill and died,____ made him very lonely.
| A．this | B．that | C．which | D．what |
Rather than ______ on a crowded bus, he always prefers a bicycle．
| A．ride; ride | B．riding; ride |
| C．ride; to ride | D．to ride; riding |