So difficult __________ it to work out the problem that I decided to ask Tom for advice.
| A．I did find | B．did I find |
| C．I have found | D．have I found |
_______ good use of learning resources such as the website and library, and you will make great progress.
| A．To make | B．Making | C．Make | D．Having made |
________, I'm glad you made that mistake, for it will serve as a warning to you.
| A．In case | B．In a way | C．In return | D．In relief |
They said Lily’s work was equal to ___ of a student who had completed four years of college.
| A．it | B．this | C．that | D．One |
The band ________ in about 1970, but happily they reunited in the mid-1980s.
| A．broke up | B．broke in | C．broke out | D．broke down |
The parents were in search _______ their son who was lost when the two countries were ______ war.
| A．of; in | B．of; at | C．for; at | D．for; in |