He has been ill for several weeks, so he has ________ in learning Maths.
A.many difficulties B.some difficulty C.a lot of troubles D.a trouble
Modest men are never________ of the progress they have made.
A.proud B.afraid C.certain D.thinking
Digital cameras are becoming more and more popular, but some still________ too much.
A.pay B.spend C.take D.cost
The dinner didn't start_______ all the friends arrived.
A.when B.while C.until D.whether
He is confident and isn't afraid of ________ a speech at assembly .
A.make B.is making C.making D.to make
We all find ________ dangerous to skate on the thin ice .
A.this B.it C.that D.\