Hawking's book A Brief History of Time came after years' hard work．（ ）
| A． |
out |
B． |
on |
C． |
down |
D． |
up |
The teacher encourages the children to feel _________ about asking questions when they don't understand．（ ）
A．nervousB．confidentC．excitedD．practical
I will see what I can do，but I can't ______ you anything．（ ）
A．planB．prepareC．promiseD．protect
Anita spoke _________ quietly that I could hardly hear her．（ ）
A．tooB．suchC．soD．very
When you are home，give me a call to let me know you __________ safely．（ ）
A．arrivedB．have arrived
C．will arriveD．are arriving
My cousin works for an airline．He flies planes．He is __________．（ ）
A．an inventorB．a scientist
C．an explorerD．a pilot