He transplanted the young tree to the park ____ it was the best time for it .
| A．where | B．when | C．what | D．that |
We can’t ____ the punctual arrival of trains in foggy weather.
| A．be sure | B．guard | C．guarantee | D．make sure |
This test ____ a number of multiple-choice questions.
| A．makes up | B．consist of | C．makes up of | D．consists of |
He soon made _____ clear why he had asked for a conference.
| A．that | B．it | C．this | D．one |
There is no doubt _____ he will finish the task in time.
| A．while | B．why | C．if | D．that |
My brother is honest. He _____ such a thing.
| A．might not do | B．can’t have done | C．can do | D．mustn’t have done |