You never know how much difficulty we had ___the problem．Luckily, we managed to solve it with his help.
| A．working out | B．work out |
| C．worked out | D．to work out |
I‘m not sure _________ next week.
| A．whether will he come |
| B．whether he will come |
| C．if will he come |
| D．if he comes |
Nancy doesn’t want to buy the skirt because ______ the colour ______ the size fits her.
| A．both…and | B．either…or |
| C．neither…nor | D．not only…but also |
—As a teacher, we can’t be _______ patient with our students．
| A．quite | B．too |
| C．very | D．so |
It’s believed that our moods are sometimes _______ by colours．Many scientists are doing research on this subject.
| A．chosen | B．influenced |
| C．required | D．explained |