An explosion is a sudden increase in amount（）……

单项选择题Some say yes and others say no; I don't know （）to follow.

A.whether
B.what
C.whom
D.how

单项选择题Shall we request the chairman（）our suggestion again?

A.toconsider
B.considering
C.consider
D.considered

单项选择题She is very nice, but because she has a（）way of speaking, she is slow in making friends

A.forbid
B.forbidding
C.forbade
D.forbidden

单项选择题His company promised to pay for his health （）in addition to other benefits.

A.examination
B.service
C.check
D.insurance

单项选择题I expected a bigger payment, but I suppose you have to be（）for small mercies.

A.pleasant
B.thanking
C.gratitude
D.thankful