14. --I tried many times, but I still failed in the experiment. --Don’t be discouraged. ____ and the problem will be settled.
The store had to___ a number of clerks because sales were down.
Have a good rest, you need to ___ your energy for the tennis match this afternoon.
. It was so noisy out side that he couldn’t ____ down to read.
He offered to ___ her a hand as the suitcase was too heavy for her to carry.
----When did the concert _____? ---Well, two or three years ago?