When you are _______ about which button to press on the complicated machine, you can either read the user’s guide for guidance or fax us for specific instruction. Don’t ______ the trial-and-error method.
| A．insure; do | B．ensure; make | C．uncertain; try | D．unsure; touch |
------Thank you ever so much for your timely help.
-----__________.
| A．Glad to hear that | B．With pleasure | C．Think nothing of it | D．All right |
Where we will build the dam has not been decided yet, ______?
| A．will we | B．has it | C．won’t we | D．hasn’t it |
The system is designed to give students easy ______ to the digital resources of the library.
| A．passage | B．way | C．approach | D．access |
One of the most important problems we will have to solve is _______ of students’ learning method.
| A．that | B．this | C．what | D．which |
. The house is nice, but ______ too small for a family of five.
| A．rarely | B．fairly | C．rather | D．pretty |